US1694501A

US1694501A - chadwic k

Info

Publication number: US1694501A
Authority: US
Publication date: 1928-12-11
Anticipated expiration: 1945-12-11

Description

Dec. 11, 1928. 7 1,694,501

} L. s. CHADWICK AUTOMATICALLY CONTROLLED BURNER Filed 00 6. s, 1925 9 Sheets-Sheet 1 1,694,501 L. S. CHADWICK AUTOMATICALLY CONTROLLED BURNER Filed Oct. 5, 1925 9 ShGOtS-SIIOQt 2 full.

N i: am Am L. S. CHADWICK AUTOMATICALLY CONTROLLED BURNER Filed Oct. 5, 1925 9 Sheets-Shut 4 L. S. CHADW|C K AUTOMATICALLY CONTROLLEP BURKE Filed Oct. 5, 1925 9 Sheets-Sheet 5 IIIII/l/II II/I/I/Il/I/I/II/II/l/Il/ III I I Inventor W W ,2 @MMM Dec. 11, 1928. L. s. CHADWICK AUTOMATICALLY CONTROLLED BURNER 9 Sheets-Sheet 6 \\\\\\\\\\\\\\\\\\w\\\\\E\\\\\N\\\\\ y N J Filed Oct. 5, 1925 ikmk JWMW R k g L. S. CHADWICK AUTQMATICALLY CONTROLLED "BURNER Dec. 1 1, I928.

Filed Oct. 5, 1925 9 Sheets-Sheet 7 Dec. 11, 1928.

L. S. CHADWICK AUTOMATICALLY CONTROLLED BURNER Filed Oct. 5, 1925 9 Sheets-Sheet 8 Jim Dec. 11, 1928.

L. s. CHADWICK Filed Oct. 5, 1925 AUTOMATICALLY CONTROLLED BURNER Patented Dec. 11, 1928.

UNITED STATES PATENT OFFICE.

LEE S. CHADWICK, OF SHAKER HEIGHTS, OHIO, ASSIGNOR TO PERFECTION STOVE COMPANY, OF CLEVELAND", OHIO, A CORPORATION OF OHIO.

AUTOMATICALLY-CONTROLLED BURNER.

Application filed October 5, 1925. Serial No. 60,425.

This invention relates to automatically controlled fuel. oil'burning apparatus, and its primary purpose is to provide apparatus of this nature that is highly eliicient, is thor- 5 oughly reliable, has a wide temperature range, and that may be easily and quickly adjusted to maintain different desired temperatures of limited range.

Apparatus quite similar to that herein disclosed are exhibited in applications Serial Nos. 726.657 and 30,999, filed jointly by Marc Resek, J. Alger Dahlstrom and myself, on July 18, 1924 and on May 18, 1925,1espectively, and more particularly in an-application filed by Marc Resck, on April 18, 1925, and

bearing Serial No. 24,052.

The apparatus is intended for use in maintaining a given range of temperature in a compartment or an apartment where thermostatic means is located for controlling the apparatus. The temperature of the compartment or apartment is affected, on the one hand, by changes in heat generated by the. 3}.)Pt1ltltll3, and, on the other hand, by changes in the atmospheric temperature.

Briefly the apparatus consists of a boiler, an atomizing burner operated by steam from ti 0 boiler and supplying heat to the boiler as well as to the compartment or apartment 30 that is to be heated, either directly or indirectly), means for controlling the proportion of heat applied to the boiler, as, for example, a damper movably supported between the burner and the boiler, and means operated by steam pressure for actuating the former means or damper. It is to a unique form of this steam pressure operated means that my present invention has particular reference.

In the present embodin'ient of the inven- 0 tion, this pressure operated means consists of a plurality of bellows arranged] to be thrown into and out of communication with the boiler respectively as the atmospheric temperature rises and falls, so as to vary the steam pressure required to deflect the heat from the boiler, as by moving the damper toward boiler shielding position. in inverse ratio to the number of bellows in communication with the boiler.

Obviously, as the atmospheric temperature drops. a greater head of steam is required to operate the burner so as to feed more fuel and produce a hotter fire and thus bring the temperature of the compartment or apart- 55 went up to the required degree. To accomplish this the control n'iechanism functions to reduce the numbiir ofbellows that are in communication with the boiler and to permit a greater proportion of heat to be applied to the boiler. As the atmosspheric temperature rises, a lesser head of steam is requiredto operate the burner and the control mechanism acts to increase the number of bellows that are in communication with the boiler and thus permit a lesser proportion of heat to be applied to the boiler.

In the accompanying drawings, Fig. 1 is a front elevation, and Fig. 2 a right hand side elevation of my improved fuel oil burning apparatus; Fig. 3 is a sectional left hand elevation, and Fig.1. 4 a sectional plan view of the apparatus; Fig. 5 is a transverse vertical section substantially on the line 55 of F ig. 3; Figs. 6 and 7 are sectional details of the auxiliary burner control valves; Fig. 8 is a front elevation of a plurality of bellows for controlling the damper; Fig. 9 is a side View, partly in section, of the valve for controlling the passage of steam to and its exhaustfrom the bellows that are shown in detail in Fig. 8, and of the electrical mechanism through which said valve is operated; Figs. 10 to 13 are sectional details on the respective, correspondingly numbered, lines of Fig. 9, the valve being shown in the same position in all views; Fig. 14: is a vertical section through the electrical mechanism for controlling the aforesaid Valve; Fig. 15 is a section on the line 15 15 of Fig. 14; Figs. 16 and 17 are elevational views, at right angles to each other, of one of the pawl carrying plates of said electrical mechanism; Figs. 18 and 19 are, respectively, a side elevation and a plan view of one of. the pawls of said mechanism; Fig. 20 is a wiring diagram of the electric control circuitinvolving the aforesaid mechanism, a thermostatic switch, and a switch operated intermittently by a moving part of the apparatus; and Fig. 21 is a sectional detail of one of the burners.

The apparatus comprises box like casing 1, having a removable top 2, and within the lower portion of the casing is located a re fractory walled combustion chamber 3 hav ing an opening 4 in its roof through which the products are adapted to pass into a compartment 5. Housed within the rear portion of this compartment is a boiler 6 that is adapted to receive a part of the products of combustion, when the damper 7 is lifted, the

damper being fulcruined at its forward edge on the corresponding side member of a frame 8 that surrounds the opening l.

The rear wallof the casing 1 has an opening 10 which is adapted to register with an opening 11 in the front wall 12 of a furnace desigi'iated generally by the reference numeral 15. This furnace may be of any approved type, as, for example, house heating furnace of the steam, hot water, or hot air vari ety. In adapting a furnace of ordinary construction for use'with my fuel oil burning apparatus, the grate is preferably removed and the opening it) of the apparatus is placed in register with the ash pit door so that, as a matter of fact, the fire bonof the furnace into which the combustion chamber of the apparatus discharges is composed of the space which ordinarily comprises the lire pot and ash pit.

Projected through an opening 19 in the front wall of the casing l is a burner designated generally by the reference numeral 20,

the same comprising a main section 21 and auxiliary sections 22. Fuel oil is supplied to the burner through a conduit 23 and its branches 24: from a reservoir 25 that is situated, in the present instance,on the right hand side of the apparatus, and the same is kept supplied with oil, to the level of an overflow pipe 26 that rises from the bottom of the reservoir, by means of an oil pump 27 which receives oil from a suitable source through a pipe 28 and delivers it through a pipe 29 to the reservoir; The overflow pipe 26 discharges into a pipe 30 that preferably leads to the source of supply with which the former pipe 28 communicates. The oil pump 27 of the reciprocating type and is operated by a steam motor 33. This motor is preferably of the cylinder and piston variety and a plunger 34, carried by the piston (not shown) projects through the rear wall of the casing. Following the usual construction of motors of this kind, the valve mechanism involving a rod 35, is actuated by the plunger through the intervention of a link 36 that is fulcruined atone end to a stud 37 on the motor casing and is pivotally connected at its opposite end to the plunger 34 and intermediate its ends to the rod 35. A contact plate 40 is carried by the plunger 34 and is adapted, upon each reciprocation of the plunger, to make contact with a stationary plate 4L1 that suitably carried by an adjacent part of the structure. 'The purpose of these contact plates will presently be described.

A steam dome 44 is connected through a nipple 45 with the top portion of thewboilcr 6, and steam is conducted from said dome, through pipes 47 and 48, and through a tube 49, to the main section 21 of the burner 20. Steam is also conducted, through branch 50 of the pipe e7, to the steam motor Supported on the right hand side of the casing 1 are the valves, illustrated in detail in Figs. 6 and through which the passage of steam to the auxiliary burner sections is controlled. The structure involving the valves is tlesis 'natcd generally by the reference numeral c1 and it comprises a base 52 having an inlet port 523 and two outlet ports 5 the L 1,1 H. j T 21 Kl s4- lattei ports being COl1UL()lAK l lj valves so Ulla are carried by frusto-conical members 56 that L :i do one of the end walls of the ,.lows i)! whose'onnosite ends are swaoed within openings or a plate so. iiie edge or this oiaic is CiiilllPQCl between the peripheral i the base and a liar portion of .we 59 of a frame 60, the parts being secured together by 0:13 screws 61. lit will be seen from this construction that the space between the plate 58 and the base 52 and into which the inlet port opens communicates with the interior of the bellows 57. Adjusting screws 63 are threadct through the frame (30 in substantially axial alignment with the valves 55, and springs are compressed between spring s 65 that are applied to said adjusting screws and the portions the frusto-conical i'neinbei's 56 which carry the valves 55. iii shell 67 encloses the frame 60 and bellows 57 and is held in place by a cap screw 68 that extends through an opening in the shell and threaded into a boss 69 of the frame 60. Tubes TO lead from the outlet ports to the auxiliary sections f the burner 20, while communication is established between the steam dome ieof the boiler l and the inlet port through a branch 72 of the steam pipe 4118.

It is apparent from the foregoing con struction that the steam pressure of the boiler is at all times communicated to the interior of the bellows 57. (i/hen th steam pressure exceeds the pressure of the springs 64:, the bellows are expanded and lift the valves off their seats so as to throw the auxiliary burner sections into communication with the steam supply. In order to cause one of the auxiliary burner sections to come into operation after the other, as w n the steam pres sure has reached given value one of the springs ea is adjusted to a higher t nsion than the other, the left hand spring in Fig. 6 be ing shown as compressed somewhat more than theright hand spring Tater is supplied to the boiler 6 through an inlet pipe 75, and its admission is controlled by suitable valve mechanism that is actuated by a float 76 hou d within a float chamber 77 which constitutes an emension of the boiler, the float, through its connection with the valve mechanism, serving to maintain a substantially constant water level in the corresponding end of the damper 7. A rod 84 constitutes the forward end of the lever 82 and the same projects through an openino 85 in the front wall of the casing. A weight 86 is applied to the rod 84 and is adapted to be held in any position to which it is adjusted along the rod, by a set screw 87. The weight 86 is set to overhalance the damper 7 and hold it in open position. This action is counteracted by the steam operated mechanism to which my invention has special reference and which I shall now proceeed to describe.

Depending from the horizontal branch of an inverted U-shaped bracket 90 that is located in the upper, forward portion of the casing 1, are a plurality of bellows, desig nated respectively, A, B, C, D and E. Inter posed between the lower ends of the bellows and the bottom walls of sockets that are formed in a cross member of the lever 82, are thrust pins 96. Through "connections which I shall presently describe, communication is established between the boiler 6 and the bellows so that upon an accumulation of sufficient steam pressure within certain of the bellows, the rear portion of the lever 82 will be depressed against the action of the weight 86 thereby to lower the damper 7 to closed position.

Suitably supported adjacent the right hanc side of the apparatus is a valve which is designated generally by the reference numeral 98, the valve casing being designated 99 and the valve body 100 (see Figs. 9 to 13). The valve body is secured, as by pins 101, to a shaft 102 that is supported by and between the end walls of the casing, the upper one of said end walls being removable and held to the casing by screws 103. This end wall has a stulling gland 104 to prevent leakage where the shaft extends into the valve casing. lVhere the shaft protrudes above the casing it has se cure-d to it a worm wheel 106 which is adapted to be drivenby aworm 107 on a shaft 108. The shaft 108 is rotatably supported within the front wall of a casing 109. Secured to the inner end of the shaft 108, within said casing. is a spur gear 110. the teeth of which are adapted to be engaged by the noses 111 of pawls 112 that are pivoted at 113 to pawl carrying plates 114. These plates are nor-- mally maintained in the position shown in 14 by the engagement of screws 115, that are threaded for adjustment through lugs 116 of the pawl carrying plates, with the side walls of the casing 109. Pivotally connected at 117 to portions of the pawls 112, that are offset with their pivots 113. are links 118 which have their upper ends pivoted to the lower ends of the movable core sections 120 of

solenoids

121 and 122. housed within the enlarged upper end of the casing 109 and covered by a plate 122.

Returning now to the valve 98, steam is ad- -out disturbing their relative at mitted to the upper end of the casing 99 thereof through a pipe 125 which connects adjacent the steam dome 44 to the previously mentioned pipe 47. It will be observed from Fig. 9 that the pipe 125 enters the valve ing 99 above the valve body 100, and at a point substantially diametrically c jiposiie the steam inlet pipe, a pipe a leads to the bellows A. Consequently, the bellows A always in communication with the boiler. Through pipes i), c, (if and c, the valve has connection with the respective bellows B, C, D and E. The passage of steam through the pipes Z), 0, (Z and e, is controlled by the valve body 100. Formed along one side of the valve body is a plurality of supply ports, I), c, d and e. Opposite the supply ports 6 and cl are exhaust ports (Z and c and the side wall of the valve body is cut away upwardly of the aforesaid port (I to provide a passageway 50 through which the pipes 7) and 0 may communicate with the exhaust port (Z? when the valve body is in certain positions. Steam and condensate are ex hausted from the lower end of the valve casing 99 through a pipe 128.

Figs. 10 to 13 inclusive represent transverse sections through the valve in the plane of the respective ports 7), c, d and. c. It will be observed that said ports terminate at one end in a line parallel. ith the axis of the valve body, while at their other ends they progress spirally about the valve body. The same is true of the exhaust ports, as well as of the passageway as, and the parts of the valve body which separate the supply and exhaust ports are of suificicut width to pre vent simultaneous communication of any one of the pipes Z) to c with a supply and. haust port.

Located within the compartment or apartment that is to be heated by the apparatus is a thermostat shown in connection with the diagram of F 20. This thermostat is comprised of a base 131 on which is mounted a thermostatic element 132 the free end of which is adapted to swing between and en

gage contacts

133 and 134 that are adjustably carried by a plate 135 that pivoted at 138 to the base. By swinging this plate the

contacts

133 and 134 may be aoji :ted with. re spect to the thermostatic el ent withstment. 135 is for the anism cause The adjustment of the plate purpose of changing the me it to maintain different tcd ra temperature, while the adjustment 0

tacts

133 and 134 is to increase or decrea .e range. To facilitate the setting of the plate 135 for given temperature ra es, it pro- 'vided with a pointer 13'? which cooperates with a scale 138 on the 131.

A source of electric energy is represented in Fig. 20 by a battery 140. One side of the battery is connected through a conductor 141 llO tact point rmostatic element 135. The conwith the tht 1s connected through a con- Y tor 146.

The construction of one of the burner sections illustrat ,d in 21. 1t. comprises frame 150 which incorporates

tubular bosses

151 and 152 to which the oil and steam pipe" are connected, respectively, by suitable unions 153. The frame incorporates sleeves 154iand 155 into which an oil nozzle S and a steam nozzle 15'? are adapted. to be inserted from the front of the frame. Each nozzle has a comparatively small duct which opens into a port that is adapted to register with the corresponding tubular boss 152. Adapted to be drawn toward the frame 150 by a bolt 160 is a head 161 which bears at its opposite ends on the forward ends of the nozzles 156 and 157. The belt 160 extends through the frame and at its inner-end receives a clamping nut 162. l orwardly of the frame, a second clamping nut 163 is carried by the bolt.

i-lrranged trai'isversely of the lower porti on of the casing 1 below the passageway 1 in the roof of the combustion chamber is a preheating burner 165. This preheating burner is in the nature of a pan having a plurality of dues 166 rising from a horizontal wall 167 below which there is an air passageway 168 that supplies air through the ducts .of 'the lines 166 to support combustion. A quantity of suitable oil may be introduced into the burner pan through a filling spout 169 that is nor, .ally closed by a cover lit), said cover also serving to close an opening 171 through which the preheating burner may be lighted.

i'ltssum ug that water is present in the boiler to the level permitted by the valve mechanism controlled by the float 76, and that a supply of oil is in the reservoir 25, to set the apparatus in operation, the preheating burner is filled and lighted and the flame therefrom rises hrough the passageway at and is deflected 'carwardly by the damper 7 about the boiler 6, :he products passing on through the openin 11 into the fire pot of the furnace, it ben under stood that in the absence of a given W ssure in the boiler the damper is held in el rated position by the weight 86. As soon as steam is created in the boiler it passes through the oipes 17 and 4:8 and through the tube 49 to the middle section 21 of the burner and starts said section of the burner in oporation. This main burner then supplies heat pre within the casing 99 by the control mechanism involving the thermosta 130 and the

solenoids

121 and 122. It will be ned,for the purpose of description, t lat the bellows l3 and C, as well as bellows A, are in communication with the boiler. As soon as sufficient steam pressure is created in the boiler to act through these three bellows to depress the damper against the action of the weight 86, the damper will be moved to closed position and shield the boiler from the products of combustion, all of the products the issuing through the rearend of t 1e combus "i sham or 3 into the fire box of the furnace. Upon a consequential drop in the steampressure, the damper will again rise to permit a part of the products to have access to the boiler, nd under an unchanging temperature condition, the damper will finally assume and'maintain a medial position. 7

Let it now be supposed that the atn'iospheric temperature has dropped to such an extent that the temperature of the compartment or apartment in which the thermostat 130 is situated is lowered enough to cause the thermostatic element 132 to swing to the right into engag ment with contact 133 whereiiipon a circuit is established, each time the steam motor 33 operates to bring the contact plates 10 and 4:1 in o engagement with each other, from the battery 140, through co tic 1411, tl ermostatic element 132, contactv 133, conductor 142, solenoid 121, conductor 1 1 1, and, through the ground, the motor casing 33, contact members and ll, and conductor 1&5, back to the battery. This will result in the solenoid 121 being energized intermittently, and as its movable core section. is retracted it will, through the link 118, first swing the corresponding pawl 112 to project its nose 111 into engagement with one of the teeth of the spur gear 110, and further movement of the core section will cause the pawl carrying plate 1141 to swing about the axis o. shaft 108 and rotate the gear and consequently the shaft through the medium of the pawl, each impulse of current passing through the solenoid causing the shaft to be rotated a lin'iited dist nee. The rotation of the shaft 108, and consequent ly the worm 107 that is secured to the shaft forwardly of the casing 109, causes the valve body 160 to be rotated through the worm gear 106 and shaft 102. The direction of otation of the valve body is such as will cause first the bellows C and then the bellows B (provided the temperature condition on which this action is predicated exists for a suificient length of time) to be cut oii from the steam supply and exhausted through the passagmvay 00 and port (Z to the exhaust pipe 128. acting through the lever 82 to depress the damper 7, to the one designated A, and consequently a much higher head of steam will be required to closethe damper than was the case when the three bellows were in communication with the boiler. This increased steam pressure naturally creates a hotter fire because the volume of steam being increased causes a great quantity of oil to be injected with the steam into the combustion chamber. WVhen the steam pressure reaches certain predeter-,

mined values, the valves are opened through the expansion of their controlling bellows 57 and steam is admitted to the auxiliary burner sections 22, thereby to further increase the fire.

While I have described the extreme case in which all bellows (excepting bellows A that is always in communication with the boiler) are'cut off from the steam supply and both auxiliary burners are thrown into operation,

it is obviousthat as soon as the temperature oi the compartment or apartment rises sufliciently to cause the thermostatic element 132 to withdraw from the contact 133, theoperation of the control mechanism will cease and the apparatus willremain in its newly adjusted.

position until a further temperature change occurs that will cause the thermostatic elethrough the branch of the circuit including the solenoid 122, whereupon said solenoid will I be energized intermittently and, through the mechanism above described, rotate the valve body in the opposite direction and throw into communication, through the ports I), 0 etc., the corresponding bellows; and as the number otbellowsthat are thrown into communicationwith the boiler increases, a lower steam pressure will prevail inthe boiler because of the fact that with the increased capacity of the bellows the damper 7'will be moved toward closed. position under the lesser head of steam. This results in a reduction in the size of the flame, the auxiliary burners becoming inactive as soon as the steam pressure recedes beyond the aforesaidpredetermined values.

V Having thus described my invention, what I claim is 1- 1. a In combination, an atomizing burner, a

boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, means controlling the proportion of This reduces the number of bellows,

means communicating with the boiler for actuating the controlling means, and temperature controlled means functioning independently of the steam pressure in the boiler for varying the quantity of steam delivered to said steam operated means.

2.. In. combination, an atomizing burner, a boiler situated to receive heat from the burner and-from which boiler the burner receives its steam supply, means for supplying 5 burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, means controlling the proportion 01": heat applied to the boiler, steam operated means communicating with the boiler tor actuating the controlling means, means functioning independently of the steam pressure in the boiler for varying the quantity of steam delivered to said steam operated means, and thermostatic mechanism subjected. to the temperature in the compartment for controlling said quantity varying means.

4. In oil burning apparatus for heating a compartment, in combination, an atomizing burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, a member arranged to intercept the passage of heat from the burner to the boiler and movable between a position wherein it does, and a position wherein it does not, shield the boiler from the heat of the burner, said member tending to move ber to the other position, conduits for delivering steam from the boiler to the respective devices, valvemeehanism functioning independently of the steam pressure in the boiler for controlling-the passage of steamto the devices, and; thermostatic mechanism subjected to the temperature in the compartment for controlling said valve mechanism.

5. In oil burning apparatus for heating a compartment, in combination, an atomizing burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, amember arranged to intercept the passage of heat from the burner to theboiler and movable between a position wherein it does, and a position wherein it does not, shield the boiler from the heat of the burner, said member tending to move toward one of said positions, a plurality of steam operated devices for moving said member to the other position, conduits for delivering steam from the boiler to the respective devices, valve mechanism for controlling the passage of steam to the devices, and thermostatic mechanism subjected to the temperature in the compartment for actuating the valve one direction while the energization of the other solenoid causes the valve to be moved inv the opposite direction, an electric circuit including a source of energy and two branches, each branch involving the winding of one of the aforesaid solenoids, a thermostatic switch in said circuit by means or" which one or the other of the branches is electrically connected with the source of energy, a second switch in thecircuit, and means for intermittently closing said second switch.

7. In con'ibination, an atomizing burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, a member arranged to intercept the passage of heat from the burner to the boiler, sald member being movable from a position wherein it shields the boiler from the heat of the burner to'a second position wherein 1t is ineliective, the member tending to move toward'one of said positions, a plurality of steam operated devices for moving the member toward the other position, conduits through which steam is delivered from the boiler to said devices, and valve mechanism controlling the passage of steam through said conduits, the valve mechanism serving, when moved in one direction, to throw said devices successively into communication with the boiler and, when moved in the opposite direction, to similarly cut oli the steam supply to said devices and exhaust them.

8. In combination, an atomizing burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, a member arranged to intercept the passage of heat from the burner to the boiler, said member beingvmovable between a position wherein it shields the boiler from heat of the burner and a second position wherein it is ineffective, the member tending" to move toward one of said positions, a plurality of steam operated devices for moving the member toward the other position, conduits through which steam is delivered from the'boiler to said devices, valve mechanism controlling the passage of steam through said conduits, the valve mechanism serving, when moved in one direction, to throw said devices successively into communication with the boiler and when moved in the opposite direction to similarly cut oil? the steam supply to said devices and exhaust them, mechanism for actuating said valve involving two solenoids, one of which when energized moves the valve in one direction, the other when energized serving to move the valve in the opposits direction, an electric circuitincluding a source of energy and two branches, each branch involving the winding of one of said solenoids, a thermostatic switch for elec trically connecting one or theother of saidbranches with the source of energy, a second switch in said circuit, and means for in termittently closing said second switch.

9. In combination, a plurality of atomizing burners, a boiler situated to receive heat from saidburners, conduits leading from the boiler to said burners, valvesincertaln of said conduits, steam operated devices connected to said valves and serving to open them when the steam pressure within the boiler attains predetermined values, means for supplying oil tothe burners, means controlling the proportion of heat applied to the boiler, steam operated means communicating with the boiler for actuating the controlling means, and temperature controlled means functioning independently ofthe steam pressure in the boiler for varying the quantity of steam delivered to the last mentioned steam operated means.

10. In oil burning apparatus for heating a compartment, in combination, a plurality of atomizing-burners, .a. boiler situated to receive heat from said burners, conduits 'leading from the boiler to said burners, valvesin certain of said conduits, steam operated devices connected to said valves and serving to open them when the steam pressure within the boiler attains predetermined values,

means for supplying oil to the burners, means controlling the proportion of heat applied to the boiler, steam operated means communieating with the boiler for actuating the controlling means, and thermostatic meansvsubjected to the temperature in the compartment for varying the quantity-of steam delivered to the-last mentioned steam operated means,

11. In combination, a plurality of atomizing burners, a boiler situated to receive heat from saidburners, conduits leading from the boiler to said burners, valves in certainof said.-

. have communication with the boiler for ac-V conduits, steam operated devices connected to said valves and serving to open them when the steam pressure within the boiler attains predetermined values, means for supplying oil to the burners, means controlling the proportion of heat applied to the boiler a plurality of steam operated devices adapted to tuating the controlling means, and temperature controlled means functioning independently of the steam pressure in the boiler for throwing certain of said devices into and out of communication with the boiler.

12. In oil burning apparatus for heating a compartment, the combination of an atomizing burner, a boiler situated to receive heat from the burner and from which boiler the burner receives its steam supply, means for supplying oil to the burner, means for controllin the proportion of heat applied to the boi er a plurality of steam operated de' vices adapted to have communication with the boiler for actuating the controlling means, means for throwing certain of said devices into and out of communication with the boiler, and thermostatic mechanism subjected to the temperature in the compartment for controlling the last mentioned means.

In testimony whereof, I hereunto aflix my signature.

LEE S. CHADWICK.