US1239611A - Carbureter. - Google Patents

Description

G. B..McBEAN & C. BIRCHWOOD.

CARBURETER.

APPLICATION FILED FEB. 4. Isoa.

Patented Sept.A 11, 1917.

2 SHEETS-SHEET l.

IIIII I UNITED STATES ,PATENT OFFICE.`

GEORGE B. MCBEAN AND CHARLES W. BIRCHWOOD, OF CHICAGO, ILLINOIS, ASSIGNORS TO MECHANICAL & ELECTRICAL MANUFACTURING COMPANY, OF CHICAGO, ILLI- '.NOIS, A. CORPORATION OF ILLINOIS.

CARBURETER.

Specification of Letters Patent.

Patented Sept. 11, 1917.

Application led February 4, 1908. Serial No. 414,160.

To all lwhom 'it may concern: i

3e it known that we, GEORGE B. MGBEAN, a citizen of the United States, and a resident of Chi ngo, Cook county, Illinois, and

'a suction, which operates to draw air into the carbureter and to discharge the hydrocarbon directly from the nozzle or. nozzles in the form of a more or less fine spray, the air and hydrocarbon spray forming an explosive mixture which is drawn into the cylinders of the motor and thereexploded, allA in a familiar manner.

This operation is objectionable for the reason, among others, that, owing -to the form in which the hydrocarbon is delivered to the carbure-ter, and thus to the motor, it does not become thoroughly mixed or intermingled with the air, and it almost invariably happens, therefore, that a much larger quantity of hydrocarbon is required to develop the maximum etliciency of the motor than would be necessary if the hydrocarbon were delivered into thecarbureter in the form of gas or vapor in aquantity sufficient to saturate the air, thus resulting in a large waste of hydrocarbon.

rl`he object o'f our invention, broadly stated, 'is to overcome this objectionable feature` by providing a carbureter in whichy the air entering the carbureterwill become saturated with hydrocarbon in gaseous'or vaporized form, thus insuring proper proportions of. air and hydrocarbon to produce perfect combustion and thereby developing the maximum eticiency of the motor with the use of a minimum quantity of hydrocarbon.

To effect this object, our improved carburcter comprises what may be properly called a vaporizer, to which hydrocarbon is delivered by means of suitable connection with a source of supply, `the said vaporizcr comprising an evaporating chamber or chambers equipped with means for finely atteuuating or thinly drawing or spreading out the hydrocarbon delivered thereto, so

that it will be quickly and thoroughly vapoi-ized when subjected to the suction of the motor and the action of the air current entering the carbureter. More specifically, our improved vaporizer comprises a vaporizing chamber, comprising one or more compartments provided with hydrocarbon supply passageways which communicate therewith adjacent to their lowerv ends and packed with a suitable porous body, preferably line wire gauze, asbestos wool, or other incombustible material, which will exert a capillary action, which, together with the suction of the motor, will cause the hydrocarbon entering said chamber or chambers to rise therein and to spread out over, comparatively, a very large surface or area, and thus to be attenuated or thinly spread out so as to be quickly and thoroughly vaporized in' the manner` desired.

A further object of the invention is to provide means for positivelyl controlling .the size of the air admission opening and of the evaporating surface of the vaporizer, Whereby the size of the air admission opening and the exposed evaporating surface of the vaporizer may be correspondingly varied, so as to produce a mixture containing the proper proportions of air and of hydrocarbon to effect perfect combustion.

A further object of the invention is to avoid loss of fuel, that is, hydrocarbon, when the motor is stopped by overflow from the float. tank through the spray nozzles.v due to lack of nicety in theadjustment and operation of the float valve which controls the delivery of hydrocarbon to the carbureter.

To effect these various objects, a carbureter of our invention comprises the various features, combinations of features and details of construction hereinafter described yand claimed.

'line 3 3 of Fig. 2.

Fig. 4 is a sectional view on the line 4-4 of Fig. 3.

Fig. 5 is a sectional elevation on the4 line 5 5 of Fig. 3; and

Fig. 6 is a top plan view of the vaporizer detached from the carbureter.

Referring now to the drawings, 1 designates the casing of the carbureter, consisting, as shown, of a hollow cylinder` the ends of which ,are closed by means of heads 2 and 3. To provide for access to the interior of the casing l, the head 3 is made removable, a flange 4 thereon being screw-threaded into the end of said casing. Obviously, if for any reason considered desirable, both heads may be made removable.

rI`he casing 1 is provided with a discharge opening 5 adapted for connection with the cylinder or cylinders of a motor by means of suitable pipe connections, not shown, and with an air admission passageway 6, formed, as shown, by a hollow downward extension 7 of said casing, said extensionl being open at its lower end.

The vaporizer, indicated as a whole by A,

' comprises a chambered body portion 8, the

i layers thereof will. prel'e'rahlv he disposed top of which is open. Said body portion 8 of the vaporizer is-positioned centrally, as nearly as may be, of the air admission passageway 6, being of substantially the same shape in cross section as said air admission passageway, but smaller, thus leaving an apen space on all sides thereof for the free passage of air into the carbureter casing. As shown, both said air admission passageway 6 and the body portion 8 of the vaporizer aresubSta'ntially rectangular in cross section, but the shape thereof is immaterial and may be varied without departure from our invention.

The chamber in the body port-ion 8 of the vaporizer is packed with a suitable porous body 9, consisting preferably of fine wire gauze, asbestos wool, or the like, which will exert a capillary action on the liquid hydrocarbon delivered into said chamber and will operate, particularly in connection with the suction of the motor, to draw the same upward through said packing, so that it will become finely .attenuated or thinly drawn out in condition to be quickly and thoroughly vaporized, so that the air entering said earbureter will become charged or saturated therewith, thus producing Aa perfect explosive mixture. lVhen wire gauze is used for forming the, parking 9, the

on edge parallel with the side walls of the body7 portion 8 of lhe, vaporizer.

The packing 9 will also proriihl a resistance to'the sin-lion of the motor on any liquid or un\'apn'ized hvdroearlwni in the vaporizer, thus preventing the motor from drawing'any liquid hvdrocai-bon or an excessive quantity ol' mporized hydrocarbon, that is more than is required to form a perfect explosive mixture.

- As shown, the chamber in the body portion 8 of the vaporizcr'is divided into difvided with a separate hydrocarbon supply passageway, which preferably opens into the bottoms of said compartments, respectively, as near the centers thereof as prac-I ticable. Preferably, also, each of said passageways is provided with independent means for controlling or adjusting the size thereof, to provide for regulating the quantity of hydrocarbon delivered to said compartments, respectively.

As shown, said passageways comprise sections 15, 16 and 17, the discharge ends of which are in open communication with the compartments 10, 11 and 12, respectively, of the vaporizer, and the opposite ends of which are in openfcommunieation with chambers 18, 19 and 20 formed in a lateral extensionl 21 of the vaporizer A formed integral with the body portion 8 thereof, said extension 21 forming a-needle valve casing, as presently explained. Said passageways also comprise sections 22, 23 and 24 which connect the chambers 18, 19 and 20, respectively, with a. common chamber 25 formed in the extension 21 of the vaporizer A. The sections 22, 23 and 24 of said passageway are respectively controlled .by needle valves- 26, 27 and 28,. the shanks of which are screw threaded to the ends of bores formed length- `,wise in the extension 21 of the vaporizer A. which, as noted, thus forms a casing for said valves. The inner ends of said needle valve bores are larger than the Shanks of lsaid needle valves at their inclosed ends and form the chambers 18, 19 and 20. The chamber 25 is connected by a pipe 29 with a tank or reservoir 30 provided ,with a supply opening 31 in its bottom adapted to be connected to a' source of hydrocarbon supply by suitable pipe connections, not shown. A desired level of hydrocarbon is adapted to be maintained in the tank or reservoir 30 land thus in the vaporizer A and its connections by means of a valve 32 controlled bv means of a lloat 33 located in the tank 30, all ina familiar manner. As shown, the float 33 is so adjusted that the normal hydrocarbon level in the vaporizer will be a short disf tance above the bottoms of the compartments 10, 11 and 12 in the body portion 8 thereof.

-F ormed' in the walls rof the ehambered .body portion 8 of the vaporizer A. above the normal hydrocarbon level, are holes or open- Our invention contemplates the use of any desired or approved form of ythrottle valve for controlling the delivery of the explosive mixture from the carbureter to the motor cylinders. ldlhere, however, said throttle is applied atothe air admission opening (l. means are also preferably provided for adjusting the evaporating surface of the vaporizer to correspond to the size of the air admission opening G. i

In the preferable construction shown, said throttle comprisesy connected, co-acting means for thus controlling both the discharge opening 5, the air admission opening 6, and for varying the area of the evaporating surface of the vaporizer to correspond to the size of said air admission opening. These means are as follows Fitted to the bore of the cylindrical casing 1 of the carbureter and mounted to rotate freely there in, is a hollow cylinder 35, Said cylinder being preferably supported by means of trunnions on the ends thereof which are fittedito suitable bearings in the heads 2 and 3 of the carburetor casing 1. The valve 35 is adapted to be rotated by means of a crank arm 36 secured to the projecting end of one of the trunnions of said valve, said crank arm be- "ing connected with a suitable hand or foot lever, not shown, by a rod 37.

Formed in the valve- 35 are port openings 38 and 39, of which the port 38 is of substan tially the same size as the discharge opening 5 and is adapted to be brought into par# `opening is closed, the port 39 is provided with a narrow forward extension 40, which is in line with tho chamber l0 of the vaporizer A, being preferably centrally in lille therewitluthe relation being such that, 'when the valve 35 is in its extreme position corresponding to full closing of the discharge opening 5 and of the air admission opening (5, the forward edge of said extension 4() of said port will be substantially even with the side of the body portion S of the vaporizer A, which is toward said port 39. From its forward end, the sides of said extension 40 diverge from each other, gradually for a short distance and then abruptly until they merge into the adjacent side of said port 3S) proper. p'l`hus, when the valve 1V is turned to open the discharge opening 5, and

` differentcompartments lO, l1 and 12 thereof,- at first gradually and then, as the width of said extension 40 increases, more rapidly,

until finally, when thelair admission opening G and the discharge opening 5 are fully open, said -vaporizer will be fully uncovered. The vaporizercA is so located that the top or upper surface of the body portion 8 thereof will extend into close proximity to the under side of the valve 35, which will thus form a closure therefor, thus efl'ectually preventing vapo'rization, excepting from the portion thereof which may be exposed through the port 39. n

A sheet of wire gauze 41 secured over the top of the chamber in the body portion 8 of the vaporizer A, contines the packing 9' therein and also prevents saidpacking from catching on the sides of the valve 35 or the-l edges of the port 39.

The needle valves 26, 27 and 28 are designed, primarily, foi regulating the-quantity of hydrocarbon delivered tothe vaporizer. By properly adjusting said valves, the size of the passages 22, 23 and 24C may be reduced until only enough hydrocarbon is delivered to the vaporizer to secure a perfect explosive mixture. In a given case, it will be necessary to determine the desired adjustment of said needle valves by actual test. Said needle valves may be secured in any desired adjustment by means of set-screws 42 threaded through the valve casing 2l in position to bear on the rvalve stems.

` Loss of hydrocarbon by overflow from the float tank 30 due to lack of sensitivene'ss of the Heat valve, is prevented by so adjusting the float valve that the normal hydrocarbon level in the vaporizer will be a suihcient distance below the perforations 34 in the walls of the body portion 8 of the vaporizer, to insure the full closing of the valve opening 3l in the bottom of the fioat tank 30 before the i hydrocarbon rises to the height of the lowermost of said perforations.

' fe claim 1.. In a carburetor, the combination of a casing provided with an air admission passageway end with a discharge opening, and` a vaporizcr, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle beingl closed to the air and the top thereof open, said rcicmtacle being provided with a hydroi carbon supply passageway, and porous packing in said receptacle, suction within the the carburetor casing operating to subject the contents of said receptacle to suction through the open top thereof, substantially casing provided with an air admission passageway and with a discharge opening, and a vaporizei, said vaporizer comprising a receptacle located iii the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, said receptacle being provided with a hydro-carbon supply passageway, and porous packing in said receptacle consisting o layers of fine' gauze disposed edgewise, suction within the carbureter casing operating to subject the contents of said receptacle to suction through the open,4 top thereof, substantially as described.

3. In a carbureter, the combination ,oiipJ casing provided with an air admission {ias-A sageway and with a discharge opening, and a vaporizer, said vaporizei' comprising a receptacle located iii the air admission passageway, the bottoni of said receptacle being closed to the air, and the top thereof open, said receptacle comprising. a plurality of separate compartments each provided with an independent hydrocarbon supply passageway, and porous packing in said compartments, substantially as described.

4. In a carbureter, the combination of a casing providedwith an air admission passageway and with a discharge opening, and a vaporizer, said vaporizer comprising a receptacle comprising a plurality of separate compartments each provided with an independent hydrocarbon supply passageway, and means for adjusting thesize ofjsaid hydrocarbon supply passageways, whereby the quantity of hydrocarbon delivered to said compartments, respectively, may be independently regulated, and porous packing in said compartments, substantially as described.

5. In a carbureter, the combination of a casing provided with an air admission passageway'and with a discharge opening and a vaporizer, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, said receptacle being provided with a hydrocarbon supply passageway, a valve which controls said passageway,'whereby the size of saidpassageway may be adjusted to regulate the quantity of hydrocarbon delivered to said chamber, and porous packing in said chamber, substantially as described.

6. In a carbureter, the combination of a casing provided with an air admission passageway and with a discharge opening, and a vaporizer, said vaporizer comprising a i'eceptacle comprising a 'plurality of separate compartments each provided with a hydrocarbon supply passageway, said compartments l`comprising a relatively small coinpartmcnt' located at one side of said receptacle, and porous packing in said compartments, substantially as described.

7. In a carburetor, the combination of a casing provided with an air admission passageway and with a discharge opening, and a vaporizer, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle beingclosed t0 the air and the top thereof open, said receptacle being provided with a hydrocarbon supply passageway, and porous packing in said receptacle, the side walls of said receptacle being perforated, suction in the carbureter casing operating to subject the contents of saidv vaporizing receptacle to suction through the open top thereof, substantially as described.

8. In a carbureter, the combination of a casing provided with an air admission passageway and with a discharge opening, said air admission passageway being formed by a hollow extension of the carbureter casing open at its end, and a vaporizer located in said air admission passageway, said vaporizer comprising a receptacle located in the air admission said receptacle eing closedto the air and the to thereof open said receptacle being provi ed with a hydrocarbon supply passageway, and porous packing in said receptacle, suction in the carbureter casing operating to subject the contents of said vaporizing receptacle to suction through the open top thereof, substantially as described.

9. In a carbureter, the combination of a casing provided with an air admission passageway, and with a discharge opening, and a vaporizer, said vaporizer comprising a 4receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, said receptacle being provided with a hydrocarbon supply assageway, means ordefin ing a desired evel of hydrocarbon in said receptacle, and porous packing in said receptacle, the side walls of said receptacle being perforated above the normal hydrocarbon level therein, substantially as described.

10. In a carburetor, the combination of a casing provided with an air admission passageway and with a discharge opening and a vaporizer, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the to thereof o en, said receptacle being'provideid with a hy rocarbon supply'passageway, porous packing in said receptacle, and'means for varying the exposed area of the top of said receptacle, substantially as described.

n 11. In a carburetor, the combination of a casing provided with an air admission passageway and with a discharge opening and a vaporizer, said vaporizer comprising a receptacle located in'the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open,

assageway, the bottom of said receptacle being provided with a hydrocarbon supply passageway, porous packing in said receptacle, means for varying the size of the admission opening to said earbureter casing and of the exposed area of the top of 'said receptacle, substantially as described.

12. In a carbureter, the combination of a casing provided with an air admission passageway and with a. discharge opening and a vaporizer, saidvaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the'top thereof open, said receptacle being provided with a hydrocarbon supply passageway, porous packing in said receptacle, means for controlling the discharge opening from said carbureter casing to vary the size thereof, and means for varying the size of the exposed area of the top of said receptacle, substantially as described.

13. In a carbureter, the combination of a easing provided with an air admission passageway, and with a discharge opening, land a vaporizer, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, said receptacle being provided with a hydrocarboii supply passageway, porous packing in said receptacle, means for varying the size of the admission openingI tof' said carbureter casing and of the exposed a'rea of the top of said receptacle, and means for varying the size of the discharge opening from said carbureter casing, substantially as described.

14. In a carbureter, the combination of a casing. provided with an air admission passageway and with a discharge opening, and a vaporizer, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, said receptacle comprising a plurality of compartments each provided with an independent hydrocarbon supply passageway, porous packing in said compartments, means -for varying the size of the admission opening to said carbureter casing, and for covering and uncovering the tops of the compartments of the vaporizer receptacle, substantially as described.

15. In a carbureter, the combination of a easing provided with an air admission passageway and with'a discharge opening, and a 'vapori/ier, said vaporizer comprising a rcceptacle located in the air admission p assageway, the bottom of said receptacle being closed to the air and the top thereof open, said i receptacle coi'nprising a plurality of compartn'ients each provided with an independent hydrocarbon suppl y passageway, porous packing in said compartments, -means for varying the size of the admission opening to said carbureter casing, and for progressively covering and uncovering the tops of the compartments of said vaporizer receptacle in succession, substantially as described.

16. In a carbureter, the combination of a casing provided with an air admission passageway. and with a discharge opening, and a vaporizer, said vaporizer comprising a receptacle located in lthe air admission passageway, the bottom of said receptacle being closed to the air and the top thereof open, and porous packing in said receptacle, said receptacle being provided with a hydrocarbon supply passageway and eo-acting means controlling the discharge opening from said carbureter, the admission opening thereto and the exposed area of the top of the Vaporizer receptacle, whereby the sizes of said discharge opening, admission opening', andthe exposed area of the top of the vaporizer receptaclc maybe simultaneously and correspondingly varied, substantially as described.

17. In a carbureter, the combination of a casing provided with an air admission passageway formed by a hollow extension of said casing open at its end and with a discharge opening, and a vaporizer located in said air admission passageway, said vaporizer comprising a receptacle, located in the 'Jair admission passageway, the bottom of said receptacle being closed to the air ari-:l the top thereof open, said receptacle being provided with a hydrocarbon supply passageway, and porous packing in said receptacle, said earbureter easing being provided with an interior valve seat, a hollow valve mounted to rotate in said seat, said valve being provided with a port or opening adapted to be brought into aiid'out ot register with the air admission passageway to said earbureter by rotation of said valve, the position of the vaporizer receptacle within said air admission passageway being such that the open top thereof will extend into close proximity to the surface of said valve, which thus forms a closure adapted for covering and uncovering the vaporizing surface of said receptacle,substantially as described.

18. In a carburetor, the combination of a easing providedwitli an air admission passageway formed by a hollow extension of said casing open at its end and with a discharge opening, a vaporizer located in Said air admission passageway, said vaporizer comprising a receptacle located in the air admission passageway, the bottom of said i'eceptaele being closed to tlie'air and the top thereof operi, said receptacle being provided with a hydrocarbon supply passageway, and porous packing in said receptacle, said carburetor casing being provided With an interior valve seat, a hollow valve mounted to rotate in said seat, said valve being provided with a port or opening adapted to be brought into and out of register with the air admission passageway to said carbureter by rotation of said valve, the position of 4the vaporizer receptacle within said air admission passageway being such that the open top thereof will extend into] close proximity to the surface of said valve, which thus forms a closure adapted for covering and uncovering the if'aporizing surface'of said receptacle, said port or opening comprising a narrow extension at the side thereof toward the ii'aporizer when said port is closed, substantially as described.

19. In a carbureter, the combination of a casing provided with an air admission passageway formed by a hollow extension of said casing open at its end and with a discharge opening, a vaporizer located in said air admission passageway, said vaporizer comprising a receptacle located in the air admission passageway, thebottom of said receptacle being closed to the air and the top thereof open, said receptacle being provided with a hydrocarbon supply passageway, and porous packing in said receptacle, said carbureter casing being provided with an interior valve seat, a hollow valve mounted to rotate in said seat, said valve being provided with a port or opening adapted to be brought into and out of register with the air admission passageway to said carbureter by rotation of said valve, the position of the vaporizer receptacle within said air admission passageway being such that the open top thereof will extend into close proximity to the surface of said valve, which thus forms a closure adapted for covering and uncovering the vaporizing surface of said receptacle, said port or opening comprising a narrow extension at the side thereof toward the vaporizer when said port is closed, the sides of which diverge from its forward end, substantially as described.

9,0. In a carbureter'. the combination of a casing provided with' an airjidmssion passageway formed by a hollow lextension of the carbureter casingopen at its end, a discharge opening, and a vaporizer, said vaporizer comprising a receptacle positioned in said air admission passageway, said receptacle comprising a plurality of separate compartments, the bottoms of Said compartments being closed to the air and the tops thereof open and each of said compartments being provided with an independent hydrocarbon supply passageway, and porous packing in said compartments, said carbureter easing being provided with a valve seat, a hollow valve mounted to rotate in said seat, said valve being provided with a port or opening adapted to be brought into and out nf register with the air admission passageway to said casing by rotation of said valve, the position of the vaporizer receptacle within the air admission passageway being such that the tops of the compartments thereof will extend into close proximity to the surface of said valve, which will thus form a closure adapted for covering and uncovering the compartments of said receptacle in succession as said valve is rotated, substantially as described.

2l. Ina carbureter, the combination of a casing provided with an air admission passageway fprmed by a hollow extension of the carburetor casing open at its end, a discharge opening, and a vaporizer, said vaporizer comprising a receptacle positioned in said air admission passageway, said receptacle comprising a plurality of separate compartments, the bottoms of said compartments being closed to the air and the tops thereof open and each of said compartments being provided with an independent hydrocarbon supply pa ssagewav, and porous packing in said compartments, said carbureter casing being provided with a valve seat, a hollow valve mounted to rotate in said seat, said .valve being' provided with a port or opening adapted to be brought into and out of register with the air admission passageway to said casing by rotation of said valve, the position of the vaporizer receptacle within the air admission passageway being such that the tops of thc compartments thereof will extend into close proximity tothe surface of said valve, which will thus form a closure adapted for covering and uncovering the con'niartments of said receptacle in succession as said valve is rotated, said port or opening comprising a narrow extension at its side which is toward the vaporizer receptacle when said port is'closcd, substantially as described. l

22. In a carbureter, the combination of a casing provided with an air admission passageway formed by a hollow extension of the carbureter easing open at its end, a discharge opening, 'and a vaporizer, said vaporizer comprising a receptacle positioned in said air admission passageway, said receptacle comprising a plurality of separate compartments, the bottoms of said compartments being closed to the air and the tops thereof open and each of said compartments being provided with an independent hydrocarbon supply passageway, and porous pack ing in said compartments, said carbureter casing beine' provided with a valve seat, a hollow valve mounted to rotate therewith, said valve being provided with a port or lopening adapted to be brought into and out .of register with the airA admission passageway to said carbureter by rotation of said valve, the position of the vaporizer receptacle within said air admission passageway being suoli that the tops of the compartments las thereof will extend into close proXimity to the surface of said valve which will thus form a closure adapted for progressively uncovering the same in succession as said valve is rotated, the relatively small compartment of said vaporizing chamber being located at the side of the vaporizer toward said port when said port is closed and said port comprising a narrow extension in line with said grelatively small compartment of the vapor- 'izing receptacle, substantially as described.

23. A vaporizer comprising a receptacle,

i the bottom of said receptacle being closed `said compartments `being provided with an independent supply passageway, and porous packing in said compartments, whereby suction applied to said vaporizer will operate to subject the contents of said vaporizer receptacle to suction through the open top thereof, substantially asdescribed.

25. A vaporizer comprising a receptacle, `comprising a plurality of separate compartments, the bottoms of which are closed to the air and the tops thereof open, each of said compartments being provided with an independent hydrocarbon supply passageway, and means for'adjusting the sizes of said hydrocarbon supply passageways, whereby `the quantity of hydrocarbon delivered to said compartments, respectively, may be independently regulated, and porous packing in said compartments, substantiallv as dc-.

scribed. w

26. A vaporizer comprising a receptacle, comprising a plurality of separate compart ments the bottoms of which are closed to the air and the tops thereof open, said compartments being provided with hydrocarbon sup ply passageways, said compartmentsl comprising a relatively small compartment located at one side of said receptacle, and por'- ous packing in said compartments, substantially as described.

27. A vaporizer comprising a receptacle,

the bottom of said receptacle being closed to Y the air and the top thereof open, Vand said receptacle being provided with a hydrocarbon supply passageway, porous packing in said receptacle, and means for deuing a desired level of hydrocarbon in said receptacle, the side walls of said receptacle being perforated above the desired hydrocarbon level therein, substantially as described.

In testimony that we claim the foregoing as our invention, we aiX our signatures in presence'of two subscribing witnesses, this 30th day of January, A. D. 1908. GEORGE B. MCBEAN.

CHARLES W. BIRCHWOOD. Witnesses:

` K. A. COSTELLO,

M. V. MCGRATH.

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