US981218A - Apparatus for generating steam. - Google Patents

Description

El 0. NEWCOMB. APPARATUS 'FOR GENERATING STEAM. APPLICATION FILED MAYIB, 190s.

Patented Jan. 10, 1911.

3 SHEETS-SHEETI.

INVENTOR BY *7 -M '5 A ATTORNE s E. 0'. NEWOOMB. v APPARATUS FOR GENERATING STEAM.

APPLIOATIUN FILED MAY 18, 1908,

Patented Ja1 1;10, 1911.

s SHEIITFSHEET 2.

WITNESSES: I

ATTORNEYS 1B,. 0. NEWCOMB. APPARATUS FOR GENER ATING STEAM.

I APPLICATION FILED MAY18, 1903. v 981,218 Patented Jan. 10,1911. 1

. a SHEETPSHEET s. F \b INVENTOR BY I i ATTORNEYS To all whom ma/y consent:

sTA as r TE ToFFicE.

EDWARD c. nnwcoius; or NORTH scITuATE, MASSACHUSETTS, Assmnoa or om:- HALF To enonen r. CHAMBERLIN, or NEW YORK, N. Y.

arranaTus Fort GENERATING STEAM.

I Specification of Letters'latent.

- Patented Jan. 10, 1911.

Application filed May 18, 1908. Serial No. 433,342.

Be it known that I, EDWARD C. NnwooMB, a citizen of the United States, and a resident of North Scituate, county of Plymouth, and Commonwealth of Massachusetts, haverinv'ented certain new and useful Improvements-in Apparatus for Generating Steam,

of which the following is a specification.

My invention relates to the generation of steam or other vapor, and more particularly to apparatus which in whole or in part may be employed for carrying out the inventions set forth in United States Letters Patent son with the variations of demand for such energy and in substantially the same degree with said variations of demand, so that little reserve energy is required in the apparatus, and yet the steam is delivered in a substantially predetermined condition as to temperature and pressure, irrespective of the variations of demand. This is accomplished by varying the supplies of the water or other fluid to be vaporized and the fuel for heating the same in substantial unison with the variations of demand for the thermal energy contained in the steam or other vapor and each according to definite quantitative relations to said variations of demand, as more fully set forth in the patents referred to.

As shown and described in the patents re ferred to, the means for supplying the water and fuel are operated or controlled by an engine driven by the steam delivered from the generator, the supplies being controlled independently of the speed of the engine.

An object of my present improvements is to provide means for supplying water to the generator and fuel to the burner for heating the generatontwhich means are self-contained and controlled independently of an engine or other apparatus by which the steam delivered from the generator is utilized. This and other objects will in part be obvious and in part be more fully so forth in the following description.

A preferred embodiment of my present improvements comprises a burner, a generator having a continuous passage arranged to receive the water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for driving said pumps, and means rendered operas -tive by variationsrin the condition of the fluid at a'predetermined point inthe generat'or passage for controlling said pump.

In accordance with some features of the present improvements, means other than a pump may be emplo ed for supplyin the fuel, and any suitab e means provide for effecting and controlling the supply of fuel a to the burner, such, for example, as a means of the character setforth in the patents referred to. In accordance with certain features of the present in rovements, moreover, any suitable form of generator maybe employed, and the pump. driving motor may be controlled by variations in the'condition, either as to pressure, temperature, or density, of the fiuid in the generator or of the steam generated therein, depending on the character of the generator and the desired qualities of the steam generated. 'In accordance with the preferred embodiment, however, the generator is constructed of coiled pipe forming a single continuous passage arranged with relation to the combustion chamber 501 that diflerent parts of the generator are heated to different temperatures, the water being sup lied to a cooler part so that it is gradual y heated to the temperature of vaporization, gradually vaporized, and the steam superheated and delivered from a hotter portion of the. generator;

Where a generator of the preferred type is employed, to-wit, one having a continuous passage arranged to receive Water'at one end and to deliver steam at the other end, the pump driving motor is preferably controlled through a relatively wide range of duty by a relatively slight range of variations in the controlling condition of the fluid in the generator so that the condition of the generator will remain substantially uniform and the supplies of both the fuel and water be varied in substantial unison with the variations of demand for the thermal energy of the steam or other vapor delivered from the generator and according to substantially definite quan- 85 the fuel.

titative relations to said variations of demand Preferably, the condition, either as .to pressure, temperature or density, of the fluid ifiithat part of the generator wherein the water is vaporized is employed as the controlling condition, as any variation in the quantity of water in the generator or of the distribution of the heat-in the generator is necessarily accompanied by a variation of the condition of the fluid in the part of the generator referred to. If the condition of the fluid in this part of the generator is maintained substantially uniform, the condition'of the generator will remain substan-. l5 tially uniform. In. order that the steam may be. delivered from the generator at a desired or predetermined temperature and pressure, means are provided whereby the relation between the supplies of the water and the fuel may be varied. Furthermore, where the efliciency of the apparatus, viz., the mean efficiency of the generator and burner, Varies with difl'erentloads or demands for. the thermal energy of the steam, means may be provided for automatically varying the relation between the supplies of the Water and the fuel to compensate for such variations of efficiency. In carrying out this feature the variations in the temperature of the generator or of the fluid therein at. any pointwhere the temperature varies with the variations of efliciency may be utilized for automatically varying the relation between the supplies of the water and In accordance with a preferred embodiment of the presentimprovements, the pump driving motor is'a steam motor connected,

with, the generator. In order that this mo 40 tor may act with the desired promptness, ,it is preferably in constant communication with the generator and is controlled by means acting upon one of the valves by which the steam'is distributed therein, as

required to produce the movements thereof;

and, where the condition of the fluid as to pressure is utilized for controlling the motor, the latter is, for the sake of simplicity of-constructionand operation, made to communicate with that part of the generator where the variations of pressure are to be utilized, and .the' motor is controlled by means acting on the steam" distributing valve, said means being rendered operative by the variations in the pressure upon the valve. While any suitable fuel supply means may be used whereby the supply-of fuel-may be accurately regulated and quickly varied, a

liquid fuel which may be supplied to a suitable burner by a pump is preferably employed. It is to be understood also that,

any suitable liquid other than watermay be supplied to the generator.

- For the sake of brevity, I have herein referred to the variations; of the thermal energy of the steam or other, vapor delivered by the apparatus as. variations of demand for steam energy. i It is not to be understood by the expression substantial unison as used herein that the relative variations between ,the demands for the supplies of the fluids are strictly simultaneous. The essential in this regard is that the variations be produced with sufiicient promptness tomaintain the apparatus in a practically predetermined condition. For instance, .the pumps and motor for supplying the fuel and water are preferably capacitated to suppl the same at a greater rate than is require by the demand,-and said parts are operated intermittently,-the mean supplies of the fluids being varied by the variations of the frequency or ,duration of the operations of the pumps or by variations of both the frequency and the duration of such operations.

The expressions substantially in definite quantitative relation and, substantially in predetermined quantitative relation, as used herein are not to be understood as necessarily referring to unchanging relations between the supplies of the fuel and water on the one hand and the demand for steam energy on the other hand, for such relations may be made to vary. It is intended that these expressions shall comprehend such relations between the supphes of the fluids and the demand as will produce practically uniform results and maintain the apparatus in' a practically predetermined condition.

Where,for example, the efficiency of the apparatus varies materially with different demands for steam energy, the definite or predetermined relations between the supply of the water and the fuel may be so changed to compensate for variations in the efiiciency of the apparatus and to deliver the steam at the desired temperature and pressure at all times.

My present invention consists in the'novel improvement, combinations, and constructions herein shown and described.

The accompanying drawings, which are referred to herein and form a part hereof, illustrate one embodiment of my invention together with certain modifications thereof, the same servin in connection with the description to exp ain the principles of the invention.

Of the drawings, Figure 1 is a view, partly in section and partly in elevation, illustrating an apparatus constructed in accordance with certain features of the invention; Fig. 2 is a front elevation, partly in section, of the pumps and pump-operating motor for supplying water and fuel to the apparatus, and also part of a form of means for controlling the motor; Fig. 3 is a vertical section of the same :taken on the line 3-3 of Fig. 2; Fig. 4;

I within another and all being of substan is a plan view of the pumps; Fig. 5 is a ver' tical section illustrating certain details of the water pump the section being taken on the line 55 of Fig. t; and Fig. (5 is a view similar to Fig. 1, illustrating certain modi-- ficati'ons and additional features of the apparatus.

While some of the advantages of my invention may be realized by the use of various forms of generators, the best results can only be obtained in connection-with the main features of my improvements by the use of a generator having a continuous passage in which the water 1s gradually heated from its point of entrance until .itis brought to the temperature of vaporization and is then gradually vaporized, only a small quantity of the liquid in the generator being maintained at the temierature of vaporizationcorresponding tothe pressure at which the apparatus is operated.

In accordance with the particular embodiment of the invention, illustrated, the generator is constructed ofcoiled pipe forming a single continuous passage adapted to receive the Water at oneend and to deliver the steam in a su erheated condition at the other end.

As s own, the generator consists of six frusto-conical pipe coils numbered 1, 2, 3, i, 5, and 6, said coils being nested one tially the same diameter at-the larger end but successively longer from the outer coil to the inner coil so as to form an approximately cylindrical mass of heating surfaces.

The coils are connected in series, as by suit-v able connections 7, S, 9, 10, and 11. The coils surround the combustion chamber and the convolutio'ns of the coils are suitably separated from each other so as to provide passages for the flow of the roducts of combustion throughout the entire mass of heating surfaces rom the inner coil tothe outer coil, suitable shields12 and 13 being provided so as to cause all the products of combustionto pass between the convolutions of each of the coils successively from the innermost coil to the outcrn' ost coil. The outermost coil is projected outwardly at its lower end and is connected to the supply pipe 15, and the innermost coil is projected outwardly at its lower end and is connected to the steam delivery pipe 16 so that the fluid is caused to flow from the outermost coil to theinnermost coil in a general direction opposite to that in which the flow of the products of combustion takes place, whereby the heat of the products of combustion is efiiciently absorbed and the fluid-is gradually heated from the pointof entrance to the point of delivery. The total area of thepassages for the products of combustion between the convolution of each coil is successively decreased from the innermost coil to the outermost coil to correspond substanaau" was the decrease in' a volume of the 1 pro nets of combustion due to the decrease in the temperature thereof." By reason'of this construction the efficiency of the generator is high and the products of combustion are caused to flow in substantially the same path at all times, so that the distribution of the heat in the generator remains practically uniform irrespective of variations of load. This generator is substantially like the generator described in the patents hereinbefore referred to and will operate as described in said patents. The generator "is preferably 'incased in a substantially cylindrical casing 17, between the lower part of which and the shield 12 is formed an annular discharge flue for the waste products of combustion.

Any suitable means may be provided to effect the combustion of the fuel. As shown, the burner comprises a perforated plate '18, between which and a plate 1.9 is provided a chamber adapted to receive asuitable mixture of fuel and air from a central mixing tube, 20' and evenly distribute this mixture throughout the area of the perforated plate .18. As shown, the mixing tube 20 is vertically arranged and extended upwardly through the center of the space inclosedby the generator coils through the center of the top plate 21 of the generator casing. To evenly distribute the mixture, a distributing plate 22 is preferably arranged between the plates 18 and 15.), said plate 22 being connected to the lower end of the mixing tube 20 andseparated a suitable distance from the plate 19 at its outer edge. Liquid fuel.

is supplied through a pipe 23 to a vaporizing coil; 24 arranged above the burner, the vaporized fuel being led by a pipe 25 to a nozzle 26 arranged in the mouth of the mixing tube 20. For the purpose of heating the fuel vaporizer to start the burner, a suitable pilot burner is provided. As shown, the

pilot burner consists of a hollow member 27 having a vaporizing passage in its lower end to which a suitable liquid fuel is supplied by a pipe 527 and from which the vaporized fuel is led through a nozzle regulatedby a needle valve 28 to the combustion chamber in the member 27. The air necessary to support the combustion is supplied through perforations in the member 27, as shown. The pilot burner is protected by a suitable perforated casing 29, having a cup-shaped lower end adapted to receive a small quantity of alcohol or gasoleneto start the burner. The pilot burner is designed to opcrate continuously to form an igniter for the main burner so thatthe latter is permitted to become extinguished when there is no demand for steam from the generator. The vaporizer 24 of the main burner is preferably formed of small tubing having ample heating surface and a small quantity of reserve cncrgy so that the heat develcped by the burner will vary in substantial unison the vaporizer.

with the variations in'the sup ly of fuel to The mixing tube is preferably shielded fromthe heat of the combustion chamber by a tube 30, between which and the tube 20 a packing of refractory material may be provided. As shown, the generator coils are supported by a casting 31 which rests upon the base ring 32 carried by suitable brackets, one of which is illustrated at 33.

. reciprocating plunger 36 and suitable suc- 41, respectively, as shown inFig. 2.

As regards some features of the invention, the water may be supplied to the generator by any suitable form of pump, and this pump may be driven by any form of motor the operation of which may be promptly varied through a wide range of duty, and

the fuel may be supplied by any means adapted to maintain a predetermined relation between the supplies of fuel and water. As shown, the water is supplied to the generator by a pump 34-, and the fuel is supplied to the burner by a pump 35. These pumps may be of the'single acting'plunger type, as shown, the water pump having a water and fuel may be obtained by making the areas of the two plungers 36 and 39 proportionate to the desired relation between the volumes of the water and the fuel, respectively, and driving both plungers the same length of stroke. Preferably, however, the area of the fuelplunger is made slightly greater than that indicated, and the stroke of the pump made correspondingly shorter than the stroke of the fuel pump,

as by providing a suitable amount of lost motion between the fuel plunger and its operating armed; and in order that the effective displacement of the fuel plunger may be varied with relation to the displacement of the water plunger, means are provided whereby the'lost motion between the fuel plunger and the arm 44 may be varied. As shown, the plunger 39 is provided with a pair of collars or projections 45 and 46 between which the arm 44Lplays with the' desired lost motion, the amount of which may be varied byvarying the distance between the said collars. As shown, the colla1 46 is .in the form, of apair of lock nuts threaded on the lower end of the plunger.

The pumps may be connected to and springs 60 and 61.

driven by themotor inany suitable way. As shown, a steam motor is provided, the same including a single acting piston 47 mounted in a cylinder48 and having a piston rod 19 arranged in line with the plunger stood that for the sake of clearness in the '36 of the water pump. It will be underdrawing the pumps and motor are drawn.

to a larger scale than the generator as represented in F i 1. As actually constructed, the pumps and motor are about three-fifths the size shown in proportion to the size of the generator as shown, and the generator is constructed of three-quarter inch seamless steel tubing.

The steam may be admitted to and dis-' power cylinder 48 and communicating there-' with through a port. 54. The valves may be alternately opened and closed by any suitable mechanism operated by the reciprocation of the steam piston or of parts moving therewith. As shown, the distributing valves 50 and 51 are operated by stems 55 and 56, respectively, said stems projecting upwardly through perforations in the valve ehest 53 and arranged to be acted upon by the opposite ends of a lever 57 pivotall mounted at an intermediate-point on a fu crum post adjustably secured on the steam chest 53. The lever 57 is oscillated by a rod 58 pivotally eon'nectel to the lever 57 and passing through an arm 59 fixed on the arm.

44. The motions of the arm 59 are communicated in each direction to the rod 58 by means of springs 60 and 61 arranged on the rod 58 on the opposite sides of the arm 59. In order that the tension of. these springs maybe varied, adjusting nuts 60 and 61 are provided for the respective Steam is admitted to the pump beneath the valve 50 through a pi e 62, and the steam is exhausted through the valve 51 and may be delivered at any desired; point through the exhaust pipe 63. It-

will be seen that by suitably tensioning the springs 60 and 61, the valves 50 and 51 will be alternately opened and closed as the parts reach or approach the opposite ends of their strokes so that the piston will be alternately driven upward and allowed to descend, as required to operate the pumps. While the motor may be made double acting, as

b duplicating the valve mechanism described:

it is ,preferred to make it single acting and cause thedownward or idle stroke thereof together with-the suction strokes of-thetwo gpumpsibyia spring or springs. ,As shown,

'twotension sprlngs 64 and Soars-provided,

the same being arranged between suitable supports at zthe loweriend of:the supporting frame 66 of thepump structure and acrossarm-67 zfixed on the lowerend of the water plunger 36. i i y In order that the pumps .may be operated ;by hand,--as-reguired to start the apparatus,

a suitable hand lever .68 is provided, the same, as shown, being pivoted onthe supporting frame 66 and having an arm 69 adapted to engage a shoulder or ledge 70 lonthe hub of the crossarm 67.

While the pump-driving motor may be controlled in various ways, -.preferably and as shown, it .IS controlled'by one-o-fqthe steam distributing valves 50 and 51.

Tothisend the condition-asfto pressure'ofithe steam in the .-generator is utilized Ito control the mo- I theimotor maybe adapted-to efficiently operate :the ,IllOtOI, it is preferred to connect the same to a part of the generator which-is apgproxim'atelyat the end of the vaporizing rportion of the generator; or, if ,the connection 1s.ma de zto thevaporizing portion ata point where .water is not all vaporized, the

connecting pipe .may be passed through the combustion chamber so as to complete the .vaporization'and dry or superheat'the steam before lit reaches :the motor. As shown, .the pipe- 62 ,co1nmunicates with the connection 11 between the xi-nnermostcoilsfi and-6 of-the .genera'ton; it having been .found -:in practice that-with,-a generator constructed :as shown and described the point indicated will be near the of that-part of the generator in which the'ivapor-ization takes place under normal conditions. If desired, the pipe 62 mayibe extended through the combustion chamber in order -to "thoroughly .dry -:or super-heat the steam before it is delivered to thepump. y

In gtheembodiment of the invention illustrated the pump .is referably in normal communicationwith2t e generatonvand the variations -:ofthe pressure in that part of the generator with which .the pum ,is in communication may doe rendered e ective. to control the pump through either one of the steam distributing valves. Assuming that thegparts are in the position shown in 2, it will be seen that the valve 50 is he d to its seat by the pressure of the steam in addition to the light ,pressure of the spring 52 and that this ,pressure is opposed by the compression of the spring '60. The

.steam pressure Ihas access to thelower'part of'this valve 50-through a small 0 ening in the side thereof .(shown at the le t-of Fig.

.2) which communicates with lthe recess in which the spring 62 is located and also through the small annular ,passage formed by the loose fit of the valve '50 in its socket. When the pressure of the steam falls so :that the forceacting upon the valve is less than the force exerted by the spring '60, the valve will open and admit steam to the power cylinder so as'to drive the motor ,p'is ton 47 upward. This ,pressure will a'lsofbe :transmitted to the under side of the valve 51 through the opening in the side thereof, as explained in connection with valve 50,

and will act'together with the spring under A that valve to hold itto its seat, these forces also .acting through the stems 55 and 56 and lever 57 to hold the valve 50 oh? its seat. As the parts approach the upper limit of their stroke, the spring 61 will be put under compression and this spring may be so atljusted that it will force the valve 51 oil its seat .even though the pressure of the-steam begreater than it was whenthe valve was opened. The opening of the valve '51 will permit the-closing of the valve 50 so that the steam will'be shut oif 'from the cylinder and the steam in the cylinder will'be permitted to. escape through the valve 51 so that the-. iston.together with the pump plungers maybe returned by the springs 64 and 65. If

the waterand fuel supplied to the generator and burner, respectively, by a single operation of the pumps serve to raise the pressure inthe generator su'fiiciently to prevent the opening of the valve 50,.th e motor will remain at rest, when the parts return, until .the :pressuredn the generator again drops below the point predetermined by the ad- ,ju'stment o'fthe tensionof the spring 60. It will'be seen that by suitably adjusting the springs 60 and 61,, the operation of the motor may be controlled by the variations of ,pressure .acting upon either or both the valves 50 ,and 5,1. It-=is found in practice that this device is extremely sensitive, the

operation of the .motor being controlled through its maximum range-of duty by a very slight range of variations in pressure of thesteam admitted to the motor.

(The speed at which the motor .operates may be controlled in any desired manner. The power strokemay be regulated by-suitably restricting the f-flow of the water from the water pump to the generator, [as by .-means of the vaflveal5 'in the water supply pipe. The speedof this stroke of thepump may also .be controlled by restricting the flow of the steam to the pump, as by means of the valve 62 in the pipe by which the motor is connected to the generator. The V speed of the return stroke of the motor and 5, pumps may also be controlled by any suitable means, as by restricting the passage through which the steam is exhausted from the power cylinder. Preferably, this restriction is located in the port 54 ata point 10 between the power cylinder and the exhaust valve, as by providing a restricting valve 54* in said port. If this restriction -should be located so that the back pressure produced in the power cylinder were communicated to the top of the valve 50, such pressure would tend to open said valve and thereby interfere with the accurate control of the motor. By having the motor in con stant communication with the generator, it

is kept in a heated condition and the steam, when admitted to the power cylinder, will be immediately effective to cause the prompt operation of the motor.

In accordance with the construction illustrated in Fig. 6, the fuel pump plunger 39* is connected with the water pump plunger :by a lever 4 4 pivoted at an intermediate point-so that when the water pump plunger is making its displacement or supply stroke, the fuel pump plunger is making its return or suction stroke, and vice versa. By reason of this construction the return stroke of the water pump and motor may be controlled by the pressure developed in the vaporizer of the burner, which pressure would depend upon and never exceed that due to the tension of thespring which effects said return movement. In this 'way the pressure in the fuel vaporizer is automati- 40 cally limited and may be determined so that the burner'will always operate at the desired capacity and cannot be operated at a higher capacity or be overloaded. With this construction also the --valves and passages 4 5'by which the steam is admitted toand discharged from the power cylinder may be made as large as required to secure a prompt action of the motor even if there should be an accumulation of water in the power cylinder. ,In this construction the return quired for starting the apparat s.) If desired,'the apparatus maybe 'started'orheated up by supplying fuel to the burner with I out supplying water to the generator. To this end the fuel'pump plunger is provided GO'witha handle 73 whereby the fuel pump may be 'opera-t'ed by hand without operating the water pump. As shown, the handle 73 is pivotedto the plunger 39 at a point above the end of the .lever 44 and carries the adjustable collar 46 whereby thestroke of the pump may be varied, so that when the handle is swung up to the horizontal position, the fuel pump is disconnected from the lever 44 and may be operated independently of the water pump. The handle 73 may be secured in its horizontal position by a pin passing through a hole in the handle and a corresponding hole or holes in a lateral extension of the collar 45* on the plunger 39. The motor, including the steam-distributing valves, of this construction is the same as that illustrated in Figs. 1, 2, and 3, As shown in Fig. 6, however, the springs and 61 are represented so adjusted that the exhaust valve 51 is utilized to effect the control o'f'the motor, the power cylinder being normally in communication with the generator. With this arrangement itwill be observed that each supply of fuel to the burner always precedes the corresponding supply of water to the generator, the restoration of the normal condition of the generator being thereby more promptly effected.

Where the efficiency of the apparatus varies for any reason, as with variations of load, the predeterminedrelation between the supplies of fuel and water which the pumps tend to'maintain may be automatically varied in numerous ways, as by means actiing to control the effective delivery of either or both the pumps, said means being rendered operative byi ariations in some condition of the generator or the fluid therein, which result from variations in the efficiency of the apparatus; I

y In accordance with one-feature of the invention and as shown, theeffective delivery of the fuel pump is controlled by means acting intermittently to prevent the suction valve from seating, thereby permitting a charge of fuel to be returned to the fuel supply instead of being delivered to the burner. As, shown, a pin 75 is arranged above the suction valve 40 of the fuel pump, said pin projecting through the pump casing where it is adapted to be engaged by a set screw 76 adjustably fixed on a lever 77 pivoted on the casing and connected by its short arm 78 with one end of a Bourdon. tube 79 rigidly fixed at'its other end to the pump casing. The Bourdon tuba; may be connected to any predetermined point in the generagenerator or the burner or of both members, and is not subject to substantial fluctuations by reason of temporary or abnormal conditions, as by sudden changes of load.

A's.shown, the Bourdon tube is connected by a capillary pipe 80 with a vapor tension.

thermostat83 located at a point-in advance of the vaporizing portion of the boiler, as in the union 9 between the enerator coils 3 and 4. The thermostat might be located increase in the flow of the steam through the I beyond the vaporizing portion but, Where creased and the supply of'fuel will be re- .mostat and connections may be used and trolling the admission, of the steam thereto erator *must be, :suhstmt i aily thlsame "as the apparatus is Slll')j0(.t0(l to great fluctuations of demand, it should not be located so near the end of the vaporizing portion that its temperature will beincreased suflirieutly to operate the thermostat whenever the demand for steam is suddenly increased, as an superheater \villcause an increase in temperature independent of a change in the temperature of the superl'ieater. 'ith the arrangement shown the capacity of the fuel pump is so adjusted with relation to the water pump that the steam will be heated to the desired temperature under the conditions prevai-lii'ig when the apparatus least efiicient. When these conditions change so that the efficiency of the apparatus increases, the

teii'iperature of the thermostat. will be induced, the Bourdon tube being rendered. op-- erative by the variations in the condition as to temperature of the fluid at that point. in the generator passage at which the thermostat is located to varythe effective supply of fuel as required to maintain the ap-- paratus in a substantially uniform condition. The normal condition of the apparatus can be varied or predetermined by means of the set screw 76..

It is obvious that another form oftherthat by means of a suitable thermostat and connections the variations intemperature of the desired part of the generator, or of the fluid therein, might be used instead of the pressure to control the motor, as by con or the distribution of the steam therein. In either vasethe motor will be controlled through a wide range of duty bya relatively slight range of variations in the controlling condition. The motor will act therefore to maintain the condition of the generator or the fluid therein at the point from which the mot-or is controlled; substantially uni form. In order to maintain the generator in a uniform condition, the motor should be controlled from, a point in the generator such that, if the controlling condition which is utilized to control the motor is kept uniform at that point, the apparatus Will remain in a uniform condition. I have found that the generator will remain in substantially uniform condition if the pressure or the temperature of the fluid in' or' near that part of the generator Where the Water is vaporized under normal conditions be kept uniform. In that the temperature and the pressure of the fluid at this part of the gen-- erator bear a predetermined relation to each other either the temperature or the pressure may be utilized; and, furthermore, in that tilIQihQITtIPQI'RtLII'G of this part of th egen that of the fluid therein contained, the temperature of this part of the generator itself' may be utilized with the same result. In view "of the factthat the motor, acting through the fuel-andwater pumps, will tend to maintain that'part of the apparatus from which it is controlled in a substantially uniform condition irrespective of variationsin efficiency of the apparatus, the means for automatically varying the relation between the supplies of fuel and water to compensate for variations in etiiciency should be controlled from some other point of the generator. It is more desirable to utilize the variations of temperature at some point in the waterheating, portion of the generator rather than at some point in the superheating portion, as the temperm ture of the water heating portionis not as subject to abnormal fluctuations due to temporary changes of conditions, as a sudden increase in the demand for steam energy, as

is the latter portion. If the variations of the demand for steam energy are not too sudden or do not vary through too wide a 'ange, good results may. be secured by utilizing the temperature or the pressure at other points of the generator for controlling the supplies of water and fuel and the relation between said supplies.

It is to be understood that my invention in its broader aspectsis not limited to the particular construction shown, nor to any particular construction by which it has been or may be carried into effect, as the construction of the apparatus may be greatly varied Without departing from the main principles of the invention and without sacrificing its chief advantages.

I claim:

1. An a )paratus for generating steam including in combination, a burner, a generator having a continuous passage constructed to receive water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supply ing Water to the generator, a motor for simultaneously driving said pumps, and

means rendered operative by a relatively slight range of variations in the condition of the fluid at a predetermined point in the. generator passage for controlling said rnotor through a relatively Wide range of duty, whereby the supplies of both the] fuel and the Water are varied in substantial unison 0' with the variations of demand'for steam energy and in a definite quantitative relation to said variations ofdemand.

a 2. An apparatus for generating steam ineluding inv combination, a burner, a genstructed to receive amassed-indie deliver steamnt the other end, a pump for Hsupfplyii rgfuelto the burner, a .pump for supplying Water to the generator, a motor 'erator having a continuous-- pasas gefcfin guantitative relation to said variations of emand.

3. An apparatus for generating steam in for simultaneously driving said pumps, and means rendered operative by aslight range of variations in the condition of the fluid 4 at or near that part of the generator passage where the water is vaporized for controlling said motor through a. relatively wide range of duty, whereby the supplies of boththe fuel and the water are varied in substantial unison with the variations. of demandfor steam energy and in a definitemeans rendered operative by a slight range of variations in the pressure of the fluid at v or near that part of the generator passage where the water is vaporized for-controlling said motor through a relatively wide range of duty. whereby the supplies of both the fuel and the water. are variedinsubstantial -unison with the variations of demand for steam energy and in a definite quantitative relation to said variations of'demand. 4. An apparatus for generating steam in- -cluding in combination, a burner, a pump for supplyingfuel to the burner, a generator consisting of coiled pipe arranged with relation to the burnerso that difl erent portions are heated to diflerent temperatures, a pump for supplying water to a cooler part of the generator, a motor for simultaneously driving said pumps, and means rendered operativeby a relatively slight range of variations in the condition of the fluid at a hotter part of the generator for controlling said motor through a relatively wide range of duty, whereby the supplies of both the fuel and the water are varied in substantial unison with the variations of demand for steam energy and in a definitequantitative relation to said variations ofdemand.

a 5. An apparatus for generating steam including in combination, a burner, a pump for supplying fuel to the burner, a generator consisting of coiled pipe arranged with relation to the burner so that different portions are heated to different temperatures, a

. pump for supplying water to the generator,

a motorfor simultaneously driving said pumps, and means rendered operative by a relatively slight range of variations in the condition of the fluid at or near that part .of the generator where the water is vaporized for controlling said motor through a relatively wide range of dut-y Whereby the supplies of both the fuel and the water are varied in substantial unison with the variations of demandfor steam energy and in adefinite quantitativerelation to said variations of demand.

6; An apparatus for generating steam including in combination, a burner, a pump for supplying fuel to the burner, a generator consisting of coiledpipe arranged with relation to the burner so that diflferent portions are heated to different temperatures, apump for supplying water to a cooler portion of 4 the generator, a motor for simultaneously driving both said pumps, and means rendered operative by a relatively slight range of variations in the pressure at or near that part of the generator where the water is vaporized for controlling said motor throu h a relatively wide range of duty, where y the supplies of both the fuel and the water are varied in substantial'uniso'n with the variations of demand for steam energy and in a predetermined quantitative relation to said variations of demand.

'7. An apparatus for generating steam including in combination, a burner, means for fuel, whereby the supplies of both the water-- and the fuel are varied in substantial unison with the variations of demand 'for steam energy and in a definite quantitative relation to said variations of demand. Y

8. An' apparatus for generating steam including in combination, a burner, means for supplying fuel to the burner, a generator having a continuous passa e arranged to receive water at one end and at the other end, a pumpfor. supplying water tothe generator, a motor for driving said pump, means rendered operative by a, relatively slight range of variations in the condition of the fluid at a predetermined point in the generator passage for controlling said motor through a relatively wide range of duty, means tending to maintain a substantially predetermined quantitative relation between the supplies of the fuel and the water, and means for automatically vary ing said relation, whereby the supplies of both the fuel and the water are varied in substantial unison with the' variations of demand for steam energy, and in a substanto deliver steam tially predetermined quantitative relation to said variations 'of demand. "9. An apparatus for generating steam 1ncluding in combination, a burner, means for I sup plying fuel to the burner, a generator having a continuous passage arranged to receive Water at one end and to deliver steam at the other end, a pump for supplying Water to the generator, a motor for driving said pump, means rendered operative bya relatively slight range of variations in the con ditioii of the fluid at onev-poiiit'in the genera tor passage for controlling said motor through a relatively Wide range of duty, meanstending to maintain a substantially predetermined quantitative relation between the supplies of fuel and Water; and means; rendered operative by variations in the con-- d'ition of the fluid at anotherpointof the generator passage for varying therelatiom between said supplies.

10. An apparatus for generating super-- heated steam including in combination, a

burner, means for supplying fuel to the burner, a generator consisting of coiled pipe arranged with relation to the burner so that 'the' Water is gradually heated to the-temperature of vaporization; gradually vaporized and thensuperheated, a pump for supplying water to the generator, a motor for driving said pump, means rendered opera-' tive by a relatively slight range of variations iii the pressure of the fluid at or near that part of the generator Where the water is vaporized for controlling said motor through a relatively wide range of duty,

, means tending to maintain a, substantially predetermined quantitative relation between the supplies of fuel and Water, and means rendere operative by variations in the temperature of the fluid at another part of the generator for varyingthe relation between said supplies. v

11. An apparatus for generating steam including in combination, a burner, a generator having a continuous passage'arranged toreceive Water at one end and to deliver steam at the other end, a pump forsupplying fuel to the burner, a pump for supplying Water to the generator, amotor for driving said pumps, and means rendered operative by variations in the condition of the fluid at a predetermined point in the generator for controlling said motor.

12. An apparatus for generating steain'ineluding in combination, a burner, 21 generator having acontinuous passage arranged to receive water at one end and to deliver steam at the other end, a pump for supplying fuel.

to the burner, a pump for supplying Water to the generator, a motor for drivingsaid pumps, and means rendered operative by a relatively slight range of variations-in the condition of the fluid at a predetermined vpoint in the generator passage for comtrolling said mot'or through a; relatively wide range of duty.

13. An apparatus for generating steam including in combination, a burner, a generthrough a relatively Wide range of duty.

for generating steam. including in combination, a burner, a gener- 14. ALn apparatus ator having a continuous passage arranged to receive water at one end'and to deliver :steaii' at the other end, a pump for supply ing fuel to the burner, a pump, for supplying Water to the generator, a steam pump connected with the generator for driving said pumps, and means rendered operative by a relatively slight range of variations in the condition of the fluid at a predetermined point in the generator passage for controlling said motor.

15. An apparatus for generating steam including iii combination, a burner, a generto receive water at one end and-Rt'o deliver steam at the other end,'-a pump for supplying fuel to the burner, a pump for supplying Water to the generator, a steam motor connected with the generator for driving said pumps, and means rendered operative 'by a relatively slight range of variations in the ressure of the fluid at or near that part of the generator Where the water is vaporized for controlling said motor through a relatively Wide range of duty.

'16. An apparatus .for generating steam includinglin combination, a burner, a generator having a continuous passage arranged to receive Water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying' .Water to the generator, a motor for siator having a continuous passage arranged multaneously driving said pumps, means rendered operative by variations in the con dition of the" fluid at a predetermined point. in the generator passage for controlling said motor, and .means for varying the relation between the effective deliveries of said pumps. I

An apparatus. for generating steam including in combination, a burner, a gen erator having a continuous passage arranged to receive water at one end and to deliver steam'at the other end, a pump for supplying fuel to the burner, a pump for supplyin}; Water to the generator, 2 motor for simulta'neo'usly driving said pump, means rendered operative by variations in the condition of thefluid at a predetermined point in the generator passage for controlling said motor, and means for varying the effective d'elivery'of said fuel pump.

18. An apparatus for generating steamin- I cluding in combination, a burner, a generative by variations in the condition tor having a continuous passage arranged to receive water at oneend and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for simultaneously tion between the eflective deliveries of said pumps. 19. An apparatus for generating-steam including in combination, a burner,-a genera- 1201' having a continuous passage arrangedto receive Water at one end and to deliver steam at the other end, a pump for supply ing fuel to the burner, a pumpv for supplying Water to the generator, a motor for simultaneously driving said pump, means rendered operative by variations in the con -dition of the fluid at a predetermined point 25 in the generator passage for controlling said motor, and means for automaticall varying the effective delivery of said fue pump.

20. An apparatus'for generating steam including in combination, a burner, a generator having a continuous passage arranged to receive water'at one end and to deliver steam at the other end, a pump forsupplying fuel to the burner, a pump for supplying water to the generator, a motor for simultaneously driving said pumps, means renderedoperative by variatlons in one .con-

dition of the fluid in the generator for controlling said motor, and means rendered operative by another condition of the fluid in the generator for varying the relation between the efl'eetive, deliveries of said pumps.

21. An apparatus for generating steam including in combination, a burner, a generator-having a continuous passage arranged to receive water at one end and to deliver steam at the other end, apump for supplyingfuel to the burner, a pump for supplying water to thegenerator, amotor for simultaneously driving said pumps, meansrendered o erative by variations in one condition 0 the fluid 1n the generator for controlling said motor, and means rendered operative by variations in another condition of the fluid in the generator for varying the effective delivery of'the fuel pump.

22. An apparatus for generating steam including in combination, a burner, a generator having a continuous passage arranged to receive water at. one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for driving said pumps, means rendered operative by variations in the pressure of the steam for controlhng said motor, and means rendered operative by variations in the temperature of the fluid at a predetermined point in the generator passage for varying the relation between the eflective deliveries of said pumps. v

23. An apparatus for generating steam including in combination, a burner, a generator having a continuous passage arranged to receive water at one end and to deliver steam at the other end, a pump for supplying fuelto the burner, a pumpjfor supplying water to the generator, a motor for driving said umps, means rendered operative by variations in the pressure of. the 'steam' for controlling said motor, and means rendered operative by variatlons 1n the temperature of the 'fluid at a predeterminedpomt in the generator passage for varying the effective delivery of the fuel pump.

24. An apparatus for generating steam including in combination, a burner, a generator having a continuous passage arranged to receive water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for driving said pumps, means rendered operative by variationsin the condition of the fluid at one point in the. generator passage for controlling said motor, and means renderedoperative by variations in the condition of the fluid at or near another point of the generator passage for varying the relation between the effective deliveries of said pumps.

25. An apparatus for generating steam including in combination, a generator having a continuous passage arranged to recelve water at one end and to deliver steam at the. other end, a pump for supplying Water to the generator, a motor for driving said pump, and means rendered operative by variations in the condition of the fluid at a predetermined point in the generator passage for controlling said motor.

26. An apparatus for generating steam including in combination, a generator having a continuous passage arranged to receive water at one end and to deliver steam at the other end, a pump for supplying water to the generator, a motor for driving said pump, and means rendered operative by a relatively slight range of variations in the condition of the fluid at a predetermined point in the generator passage for controlling said motor through a relatively wide range of duty.

27. An apparatus for generajing steam including in combination, a gen rator-havwater to the generator, a motor for driving said pump, and means rendered operative by a relatively'slight range of variations in the condition of the fluid at or near that at the other end, a pump for supplying water to the generator, a motor for driving said pump, and means rendered operative by a relatively slight range of variations in the pressure .of the steam at or near that part of the generator where the Water is vaporized for through a relatively wide range of duty.

29. An apparatus for generating steam including in combination, a generator, a

pump for supplying water to the generator, a steam motor for driving said pump, said motor including a steam'distributing valve and being in constant. communication with the gen-arator, and means acting on said distributing valve and rendered operative by variations in the' condition of the steam to control-said'motor." v a 30. An apparatus for generating steam including in combination, a generator, a pump for supplying water to the generator, a steam motor for driving said-pump, said motor including a'steam "distributing valve and being in constant communication with the generator, and means acting on said steam distributing valve and rendered operative by variations in the pressure of thg.

steam supplied to the motor for controllin the motor.

31. An apparatus .for generating steam including in combination, a generator, a

, pump for supplying water to the generator,

a steam motor for. driving said pump, said .inotor including a steam distributing valve and fleeing in constant communication witha predetermined point in the generator, and means acting on said steam distributing valve and rendered operative by variations in the pressure of the steam admitted to the motor for controlling the motor.

32. An apparatus for generatingsteam including in combination, a generator, a pump for supplying water to the generator; a steam motor for driving said pump, said motor including a power cylinder 1n normal communication with the generator and a valve for exhausting the steam from said cylinder, and means acting on the said exhaust. valve and rendered operative by variations in the conditionof the steam in the generator for controlling said motor,

33. ,An apparatus for generating steam including in combination, a generator, a pump for supplying Water to the generator, a steam motor for driving said pump,.said motor having a power cylinder normally in communication with the generator and a valve for exhausting the steam from said controlling said motor cylinder, and; means acting on said exhaustvalve and rendered operative by variations in the pressure in the power cylinder for controlling said motor.

34.' An"apparatusfor generating steam including in combination, a generator having a continuous passage arranged to receive water atone end and to deliver steam at the other end, a pump for supplying water to the generator, a steam mot0r'fordriving' said pump, said motor including-a power cylinder in constant communication with a predetermined point'in the generator and a valve for exhausting thesteam from "said cylinder, and means acting on said exhaust valve and rendered operative by the pressure in the power cylinder for controllmg said motor.

35/An apparatus for generating steamv including in combination, a generator havg ing a continuous passage arranged to"'receive water at one end and to deliver steam at the other end, a pump for supplying water to said generator, a steam motor for driving saidpump, said motor including a powergo cylinder normally in communication with that part of the generator in which the water is vaporized and a valve for exhausting the steani frcmvsaid cylinder, and means acting on said exhaust valve and rendered 5 operative by variations in the pressure in the power vcylinder for controlling said motor. 1 Y

36. An apparatus for generating steam including in combination, a burner, a generator, a pump for supplying fuel to the burner, a pump for supplying water'to the generator, a steam motor for driving said pumps, said motor including a steam distributingvalve and being in constant communication with the generator, and means acting on said distributing valve and rendered operative'by variations in the condition of the fluid in the generator for controlling said motor.

37. An apparatus for generating superheated steam including'in combination, a burner, a generator having a continuous passage arranged to receive water at one end gradually heat and vaporize it, super heat it and deliver the superheated steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for driving said pumps, and means rendered operative by variations in the condition of the fluid at a predetermined point in the generator passage for controlling said motor.

. 38. An apparatus for generating superheated steam including in combination, a

- burner, a generator having a continuous at the other end, a pump forsupplying fuel to the burner, a pump for supplying-water to the generator, a motor for drivmg said pumps, and means rendered operative by a end gradually heat and vaporizeit, superheat it and deliver the superheated steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a motor for'driving said pumps, and means rendered operativeby a relatively slight range of variations in the condition of the fluid at or near that part of the generator where the water is va-' porized for controlling said motor through a relatively widerange of duty.

l0..An apparatus for. generating super-1 heated steam including in combination, a.

burner, a generator having a continuous passage arranged to receive w a ter at one end gradually heat and vaporize it, superheat' it and deliver the superheated steam at the other end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, 'amotor for driving said "pumps, and means rendered operative by a relatively slight range of variations in the pressure of the steam at or near that part of the generator where the water is vaporized for controlling said motor through a relatively wide range of duty.

41. An-apparatus for generating steam including in combination, a burner, a generator, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a steam motor for driving said pumps, said motor including a steam d' IS- tributin valve andbeing in constant-communication with the generator, and means acting on said distributing valve and rendered o erative by variations in the condition 0 the steam to control said motor. 42. An apparatus --for generating steamincluding in combination, a burner, a generator, a pump for supplyingfuel to the burner, a pump for supplying water to the generator, a steam motor for,driving said pumps, said motor including a .steam dis-.

tributing valve and being in constant communicatlon with the generator, and means acting on said steam distributing valve and rendered operative by variations in the pressure of the steam supplied to the motor for controlling the motor. U

43. An apparatus for generating steam including in combination, a burner, agenerator, a pump for supplying fuel to the burner, a pump for supplying waterto the generator, a steam motor for driving said pumps, said motor including a steam distributing valve and being in constant communication with a predetermined point in the generator, and means acting on said steam distributing valve and rendered operative by the variations in the pressure of the steam admitted to the motor for controlling the motor.

. 44. An apparatus for generating steam including in combination, a burner, a generator, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a steam motor for driving said pumps, said motor including a power cylinder in normal communication with the generator and a valve for exhausting the steam from said cylinder, and means actin on the said exhaust valve and rendere operative by variations in the condition of the steam in the generator for controlling said motor.

45. An apparatus forgenerating steam including in combination, a burner, a generator, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a steam motor for drivin said pumps, said motor having a power cy inder normally in communication with the generator and a valve for exhausting'the steam from said cylinder, and means acting on said exhaust valve and rendered operative b variations in the pressure in the power cy inder for controlling said motor.

46. An apparatus for generating steam including in combination, a burner, a gen-- crater having a continuous piassa e arranged to receive water at one en am? to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplymg water to the generator, a steam motor for driving said pumps, said motor including; power. cylinder in constant communication'with a predetermined oint in the generator and a valve for ex austing the steam from said cylinder, and means acting on said exhaust valve and rendered operative by variatlons in the ressure in the power cylinder for controlling said motor.

47. An apparatus ion generating steam including in combination, a burneffa'generator having a continuous passa e arranged to receive water at one end an to deliver steam at the other-end, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a steam motor for driving said pumps, said motor including a power cylinder normally in communication with that part of the which the water is vaporized an a valve for exhausting the steam from said c linder, and means acting on said exhaust va ve and rendered operative by variations in the ressure in the power cylinder for contro ling said motor. a

enerator in eluding in tor having a continuous passage arranged to .for varying the and 48. An apparatus for generating steam in eluding in combination, a burner, a genera tor, a pump for supplying fuel to the burner, a pump for supplying water to the generator, a steam motor for driving said pumps,

said motor including a steam dis'trlbuting valve and being in constant communication with the generator, means actingon said distributing valve and rendered operative by variations in one condition of the fluid in the generator for controllin said pump, and means rendered operative by variations in another condition of the fluid in the generator for varying the relation between the effective deliveries of said pumps.

49. An apparatus for generating steam incombination, a burner, a generareceive water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a to the generator,

a steam motor for driving said pumps,

sa-id motor having a steam dismunication ing on said distributingvalve and rendered operative by variationsin the condition of the fluid at one point in the generator for controlling said motor, and means rendered operative by variations in the condition of the fluid at anotherpoint in the generator efiective deliveries of said pumps.

50; An apparatus for generating steam including in combination, a burner, a genera tor having a continuous passage arranged toreceive water at one end and to deliver steam at the other end, a pump for supplying fuel to the burner, a pump for supplying Water to the generator, :1 steam'motor for driving said umps, said motormcludmga steam 'distri ut-ing valveand being 1n constant communication with a predetermined point in the generator passage, means acting on said distributing valve and rendered oper ative by variatlons in the pressure of the steam admitted to said pump for controlling said water, and means rendered operative by variations in the temperature at another point in the generator passage for varying the relation between the eifective deliveries of said pumps.

51; An apparatus for generating stealn inclndin in combination, a burner, means for supplying fuel to the burner, a generator consisting'of coiled pipe arranged with relation to said burner so that different parts of the-generator are heated to different temperatures, a pump for supplying water to a cooler part of the generator, a steam motor for driving said pump, said motor"i-ncludinga steam distributing valve and being in constant commnnication with the generator,

rendered operative by variations in the pump for supplying water v plies; tributlng valve and belng 1n constant com- I with semi genera-tor, means-act with means acting on said distributing valve condition of the fluid at a hotter part of the generator for controlling said motor, and means for maintaining a predetermined relation-between thesupplies of fuel and water.

' 52. An apparatus for generating steam ineluding in combination, a burner, means for supplying fuelto theburner, a generator consisting of coiled pi e arranged with relation to the burner so t at different parts are heated to different temperatures,'a pump for supplying water to a cooler part of the generator,'a steam motor for driving said pump, said motor including a steam distributing valve and being in constant communication with the generator, means acting on said dis tributing valve and rendered operative by variations in the condition of the fluid at a hotter part of the generator for controlling said motor, means tending to maintain a predetermined relation between the supplies 35' 1 of fuel and water, and means for automati- "cally varying the relation between said sup- 53. An apparatus for generating steam includin in combination, a burner, means for supplying fuel to the burner, a generator consisting of coiled pipe arrangedwith relation to the burner so that diflerentparts are heated to different temperatures, a pump for supplying water to a cooler part of the generator, a steam motor for driving said pump,

said motor including a steam distributing valve and being in constant communication the generator, means acting on said distributing valve and rendered operative by variations in the condition of the fluid at a hotter part of the generator for controlling said motor, means tending to maintain a predetermined relation between the supplies of fuel and water, and means rendered operative by variations in another condition of the fluid in the enerator for automatically varying the relation between the supplies of fuel and water.

551. An apparatus for generating steam ineluding in combination, a burner, a pump for supplying fuel to the burner, a-generator consisting of coiled pipe arranged with relation to'the burner so that different parts are heatedto different temperatures, a pump for supplying water to the generator, a steam.

motor for driving said'pumps, said motor including a steam distributing valve and being in constant communication with the generator, means valve and rendered operative by variations in the condition of the fluid at one point of the generator passage for controlling said motor, and means rendered operative by variations in the condition of the fluid at another point in the generator for varying the relation between the effective deliveries of the pumps. a

" 5-5; An apparatus for generating steam including in combination, a burner, means for acting on said distributing 120 v cooler supplying fuel to the burner, .a generator consisting of coiled pipe arranged with relation to the burner so that different parts of the generator are heated to different temperatures, a pump for supplying water to a part-of the generator, a steam motor for urlving' said ump, said motor including a steam distri 'uting valve and being in generator or varying said predetermined relation.

56. An apparatus for generating super heated steam including in combination, a

iburner, means for supplying fuel to the burner, a' generator consisting of coiled pipe arranged with'relation to the burner so that the water is gradually heated, gradually vaporized, and then superheated, a pump for supplying water to the generator, a steam motor for driving said ump, said motor including a steam distributing valve and being in constant communication with said generator, means acting on' said distributmg valve and rendered o erative by a slight range of variations in t e pressure of the steam at or near that part of the generator where the water is vaporized for controlling the motor through a wide range of duty, means tending to maintain a predetermined relation between the supplies of, fuel and water, and means rendered operative by variationsin the temperature at a cooler part of the generator 'for varying .said predetermined -relation, whereby the effective supplies of fuel and water are varied in substantial unison with the variations of demand for steam energy and in substantially .the same degree with said variations of demand. 4 v

57. An apparatus for generating 'su'perheated steam including in combination, a burner, a pump'for supplying fuel to the burner, a generator consisting of coiled pipe arranged with relation to the burner so that the water is gradually heated,1. ;:gradually vaporized, and then superheated, a pump for supplying water to the generator, a steam motor for driving said pumps, said motor including a steam distributing valve and .being in constant communication with said generator, means aoting'on said distributing valve and rendered operative by a slight range of variations in the pressure of the steam at or near that part .of theizgenerator' where the water isvaporized for controlling themotor through a wide range of duty, andv means rendered operatlve by variations in temperature at a cooler art of the generator for var ing the re ation between the effective deliveries of said umps, whereby the effective supplies of foe and water are varied in substantial unison with the variations of demand for steam energy and in substantially the same degreewith said variations of demand.

58. An apparatus for generating superheated steam including in combination, a burner, a pump for supplying fuel to the burner, a generator conslsting of coiled pipe arranged with relation to the burner so that the water is gradually heated, gradually vaporized, and then, superheated, a pump for supplying water to the generator, a

motor including a steam distributing vvalve and being-in constant communication with that part of the generator at or near which the water is vaporized, means acting on said steam motor for driving said pumps, said distributing valve and rendered operative I by variations in the pressure of the steam admitted to the burnerfor controlling said motor, and meansrendered operative by variations in the temperature at another part of the generator for varying the relation between the effective deliveries of said pumps, whereby the effective supplies of fueland water'are varied in substantial uni- I son with the variations of demand for steam energy and in substantially the same degree with said variations of demand.

59. An apparatus for generating superheated steam including in combination, a burner, means for supplying fuel to the arrangedwith relation to the burner so that the water is gradually heated, gradually vaporized, and then superheated, a pump for supplying water to the generator, a steam motor for driving said pumps connected with said generator, means rendered operative by a, slight range of variations in the pressure in the generator for controlling said motor through awide, range of duty,

- means tending to maintain a predetermined relation between the. su plies of fuel and water, and means ren ered operative by variations in the temperature at a predetermined point in the generator for varylng said predetermined relation, whereby the efiective supplies of fuel and water are varied in 'substantialunison with the variations of demand for steam energy and in substantially .the same deg'ree with said variations ofdemand.

,, ,60; An apparatus forgenerating superheated steam including: in combination, a burner, a pump fonsup'plying fuel to the burner, ag'enerator-conslsting of coiled pipe arranged with relation .to the burner so that the water is gradually heated, gradually vaporized, and then superheated, a pump for supplying water tothe generator, a steam burner, .a generator consisting of coiledpipe motor connected With the generator for driving said pumps, means rendered operative by a-slight range of variations in the pressure of thesteam at or near that pait of the generator where the Water is vaporized for controlling said motor through a Wide range of duty, and means rendered operative by variations in the temperature at a predetermined part of the enerator for eontrolling the effective de ivery of the fuel pump, whereby the effective supplies of the energy and in substantially the same degree with said variations of demand.

In testimony whereof, l have signed my name to this specification, in the presence of two subscribing witnesses.

EDYVARD C. NEVVCOMB. Witnesses:

EDWIN SEGER, WM. J. DOLAN.

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