US1399756A - Air-heater - Google Patents

Description

E. J. ELLISON.

AIR HEATER.

W APPLICATION FILED NOV. 15. 1920. 1 W. Patented Dem. 113., M21.

5 SHEETS-SHEET E J. ELLISON, AIR HEATER. APPLICATION FILED NQV.15. I920.

5 SHEETS-SHEET'Z.

Patented Dem 113 E. J. ELLISON.

AIR HEATER.

APPLICATION FILED NOV=15| I920.

Patented Dem 113 1921b 5 SHEETS-SHEET 3.

E. J. ELLISON.

AIR HEATER.

APPLICATION FILED NOV. 15. 1920.

Patentm Dem 13,, ML

5 SHEETS-SHEET 4.

I EMZJZZZZJWZ E. J. ELLISON.

AIR HEATER.

APPLICATION FILED NOV. 15. 1920.

Patented Dam L3 WELL 5 SHEETS-SHEET 5.

Zfmm' llii UNITED STATES EARL J. ELLISON, OF HAYWOOD, ILLINOIS, ASSIGNUR T0 ELLIS/0N ENGINEERING- ZEURNACE (10., 0F CHICAGQ, ILLINOIS, A COURATION 01F ILUIS.

l l -HEATER.

Specification of Letters Patent.

Patented bite. is, iai.

To all whom it may concern:

Be it known that I, EARL J. Emerson, a citizen of the United States, and resident of Maywood, in the county of @ook and State of Illinois, have invented a certain new and useful Improvement in Air-Heaters, of which the following is a full, clear, concise, and exact description, reference be ing had to the accompanying drawings, forming a part of. this specification.

My invention relates to air heaters ofthe type used either singly or in batteries for heating air, either for heating and ventilating purposes, or for high temperature dryingdand dehydrating processes.

no object of m invention is to improve the etliciencyof, evices of this character by so reorganizing the structure as to cause the air to be heated to travel serially substantially horizontally'through two chamhers, one inclosing the combustion chamber, and the other inclosing a radiator receiving its heat from the burned gases from the combustion chamber. By this construction, ll am able to increase the length of the passage through which the air is being heated over that of the former vertical air travel heater, and thus retain the air in contact with radiating portions of my heater for a greater length of time but still at the proper velocity for economical operation.

Another object of my invention is to so organize the parts of my heater that when a plurality of units are placed side by side in battery form the ash pits of the various units are united into one ash chamber, ex-' tending from unit to unit. By this construction, lam able to expose the outer sur-, face of the tire box lining directly to the ash pit air. This arrangement makes possible the elimination of the usual outer wall within which the fire box lining is supported, and which creates a space into Whlch ash dust collects which prevents the free radiation, of heat from the external side of the fire box lining, and causes the lining to become overheated, and burned out. The outer wall in the vertical air travel heater is present to prevent this loose ash dust from being carried upwardly, with the heated fresh air. In accordance with my invention, however, such loose dust as passes around or through the fire box lining will fall directly into the ash pit.

Another object of my invention is to provide a novel arrangement of dampers by means of which individual units of a battery may be cut out of service, notwithstanding the common ash pit. 3

Another feature of my invention resides in the novel construction of the radiator section of my heater by means of which eddy pockets are avoided, and by means of which complete cleaning can be readily accomplished.

Another feature of my invention resides in the provision of a rear ash nit wall, which supports the main weight of the heater, and upon which substantially all of the movement due to expansion and contraction of the heater parts takes place.

Another feature of my invention resides in the method of supporting the side plates of the combustion chamber whereby they are allowed. free contraction and expansion while automatically maintaining a substantially tight seal between combustion chamher and fresh air chamber.

Another feature of the invention resides in the provision of auxiliary passageways leading from the top of the front of the ash pit to the front of the combustion gas chamber of the radiator by means of which the deposits in the radiator may be dumped directly into the ash pit, these passageways being provided with dampers which may be opened for the purpose in the individual unit.

Other objects oi the invention will be more clearly brought out in the following detailed description of the heater.

My invention is illustrated in the acc0m panying drawings in which like parts are designated-by like numerals throughout the several views, and in which- Figure 1 is an isometric view partially in section of a single unit, illustrated as the left hand one of a battery of units.

till) hit of checking the tire til Fig; 2 is a rear elevation partially in v section.

Fig. 3 is a vertical section taken on the line 3-3 of Fig. 2.

Fig. A is a horizontal view partiallyin section taken on. the line 4-4 of Fig. 2,

this figure showing also the relation of adjacent units when connected in battery form.

Fig. 5 is a partial section taken on, the line 5-5 of the Fig. 4:.

Fig. 6 is an isometric view of a detail.

lltlh Fig. 7 is a section taken on line 77 of Fig. 4.

' In carrying out my invention, I preferably form the front of the furnace of a plurality of articulated cast plates 10, 11,

. 12, 13 joining one another by lap joints at 14, 15, and 16. Each of these plates is se-.

curely attached at each end to vertical T shaped columns 17 which are anchored at the floor and extend throughout the height of the heater, and constitute the support for the front wall of the warm air chamber, to be hereinafter described. These plates 10 to 13 inclusive, are provided with suitable ash, fuel and cleaning doors, and together with the columns to which they are secured form' a rigid heater front structure, to which all of the other parts of the heater are anchored, means being provided for permitting variations in expansion of the parts anchored to the front plate, as will be hereinafter more clearly described.

A vertical plate 20 constitutes the rear wall of the ash pit and serves as a support for the central portion of the combustion chamber. Side wall supporting channels 21 extend between plate 10, whereon they are rigidly secured, and this plate 20, whereon they are supported, within a saddle 22 in a longitudina-l sliding contact. Resting upon the upper edge of the plate 20 is a plate 23, which forms the floor for one section of the rear portion of the combustion chamber. The rear of this plate, issupported on. a pair of jack legs 24 and in turn supports and is bolted to the next floor plate 25, the rear of "which is similarly supported by the jack legs 26. These floor plates 23 and 25 are cast with channel-shaped side portionswhich conform in section with the channel members 21, these members being so alined that the V shaped channel of each of them forms a continuous support for the articulated side walls of the combustion chamber.

The rear edge of the floor plate 25 is provided with a groove similar to that extending along its sides into which the rear end plate 27 of the combustion chamber rests.

By means of the construction just described, the variations in expansion and con traction between the walls of the combustion chamber and the floor plates 23 and 25 and rails 21,upon which the combustion chamber walls rest, is taken up at the joints which occur immediately above'the plate 20. As will hereinafter be more fully described, the side walls 'of the combustion chamber are anchored to the heater front plate. The expansion of these side walls carries the rearwall away from the front wall a distance which sometimes reaches 1% inches. The floor plate 25 is caused to move with the back plate 27- of the heater, and since the plate25 is an chored to theplate 23, floor plate 23 is also caused to move by the expansion of the side weight holding these parts together, the joint formed between them is further protected by the overlapping edge of the rear firebox lining 30. The joint between the supporting base members comprising channel bars 21 and the plates 23 and 25, and the side and rear wallsof the heater are automatically sealed by the weight of the heater itself, which continually presses the lower edges of the side, and rear walls into the V-shaped grooves of the supporting members; but in addition to this, sealing or packing material Such as asbestos fiber of rope-like construc tion is preferably used along the outer art of the V-shaped groove as-shown at 29. he only opening at 31) which is not protected through the parts hereinbefore described is closed by the ash pit cover 37, which unites the plate 20 with the heater front plate and serves to retain the sealing material 29 in place.

The packing material 29 may be held in ash pit cover 37 sealed upon the ledge 39 at the lower opening of the check flue 4.0 and upon the ledge 41 protruding from the inner face of the front plate and bolted thereto.

'The combustion chamber proper is composed of a plurality of articulated members bolted together at the joints and so con-.

structed that replacement of damaged sections can be readily made. The forward combustion chamber section 43 is somewhat .flaring in shape and converges to the front,

where it is secured to both sections 10 and 11 of the furnace front plate at a plurality of points surrounding t e fuel door. The rear of this section 43 ,is shaped to conform with the cross-section of the combustion chamber and is provided with a continuous flan to which the sidewall sections 44 and the h rst arched top section 45 are bolted, the top section 45 being also bolted to the upper flange of the first side wallsection 44.

'The entire side wall of the combustion chamber is composed'of sections similar to section 44, bolted together by means of 43 and 44 are united.

neonate flanges similar to those by which the sections ilrewise, the entire top of the combustion chamber is formed of sections bolted to one another and to the other side wall sections. lit will be noted that the forward top section 45 is of sufficient length that its rear flange comes opposite the middle portion of the second side wall section, this construction providing strength and rigidity to the combustion chamber. Other sections of the top, however, are of equal length with the sections of the side wall; so that in order to construct heaters of difi'erent size and capacity, it is only necessary to supply additional intermediate top and side sections.

Above the combustion chamber is the section of the heater known as the radiator section. This section comprises four or more horizontal tubes 50, supported between the heater front plate and the rear of the combustion chamber. The tubes 50 are preferably bolted to the inside flanges 51 and 52 of the front plate 13, these flanges extending vertically oneach side of each radiator cleaning door. The radiator sections are connected together at the forward end of the heater by means of the cross-connecting sections 53, which provide communication be tween the two adjacent radiator tubes at each side of the heater. The tubes 50 are composed of cast sections shown in detail in Figs. 3 and 5, and arranged with overlapping staggered joints. Each section is bolted to its opposing section and on account of the staggered relation of each section to its opposing section, the entire radiator tube becomes a rigid construction, the overlapping joints providing means for re taining cement or other sealing material to prevent leakage between the tubes which carry the combustion gases and the exterior thereof, which constitutes the fresh air passage. The inner two of the radiator tubes are connected at the rear through vertical tubular sections 55 with the rear of the combustion chamber. The tubes 55 are rigidly secured to the radiator sections, and at the ends where they communicate with the combustion chamber, extend through openings in a sliding sealing plate 56, this plate being provided with a depending flange which extends into V-shaped groovesatthe sides of the single opening into the I combustion chamber, and which overhang a pair of upwardly turned projecting edges at the forward and rear of the opening into the combustion chamber, leavin a space for packing material 57 so tha the plate 56 may move backward and forward to compensate for the variation in expansion between the combustion chamber and the radiator section. This construction is such that a substantially air-tight joint is maintained between the ring 56 and the top section at the rear of the combustion chamber, through which the combustion gases pass.

The outer radiator tubes are connected at their rear with the smokebox 58, suitable dampers 59 being provided to closethe opening between the smokebox and these outer radiator sections. The inner radiator sections are also arranged for direct communication with the smokebox 58, this direct communication being normally closed by means of a damper 60, the purpose of which will be fully described in connection with the operation of the heater. This smoke-box 58 is provided with alternate stack openings 61, either of which may be used to afford communication with a suitable chimney. The smokebox 58 is supported upon the rear sections of the inner pair of radiator tubes,

and in turn acts as a support for the rear ends of the two outer radiator tubes, these latter depending from. the base of the smokebox and being secured thereto by suitable bolts.

Located between the combustion chamber and the radiator section is a ballle plate 64 which, taken with a second ballle plate 65 located above the radiator section, constitutes an important feature of my invention. These battle plates cooperate to cause the horizontal flow of air along and above the combustion chamber and along, above, below and between the tubes of the radiator section. The battle plates 64 and 65 each extend from side wall to side wall of the heater, whether or not this heater be composed of a single unit or a battery of units. lln the latter case, divisions may or may not be provided between units. Where no dividing plates are provided, the batlles 6d and 65 may be supported by means of rods 67, which depend from the warm air chamber ceiling 68. The baflle plate 641: extendst near the front of the heater to the rem wall 69 of the warm airchamber, thus dividing the warm air chamber horizontally in two parts between which the only normal com munication is around the front end of the battle plate 64:, the length of this plate being such that the opening between it and the front plate is of substantially the same area as that of other portions of the air path; for example, around the combustion chamber and around and through the radiator section.

In a similar manner, the baffle plate 65 xtends rearwardly from the front wall of the warm air chamber to a point adjacent or near the smokebox, thus causing all of the air which passes around the forward end of the baiile plate 64 to travel again in a horizontal direction along and around the radiator sections, the major portion of this air passing into the outlet portion of the warm air chamber between the radiator sections and under the smokebox, while the rest levers-78 and 79 respectively.

passes upwardly between the. smokebox and the rear edge of the baflle plate 65.

- Any suitable grate may be used for supporting the fuel in the forward part of the firebox. The preferred form of the grate, however, comprises a plurality of rockers 70 supported upon grate stringers 71, which j rest upon a saddle 72 formed on the plate 20, and are securely bolted to the lower front plate 10 at 73. These grates are rocked by means of a connecting link 7 4 connected with a suitable handle 75, located outside the front of the heater.

The dampers 59 and 60 are controlled by suitable rods 75 and 76, terminating on the front of the heater in suitable adjusting Dampers 80 are located in the check flues 40, and are arranged to be opened by means of levers 81, when it is desired to drop soot and ashes from the radiator sections to the ash pit. These dampers may also be opened for checking the fire, but will ordinarily be kept closed hot inthe regular operation of the heater.

(The path of travel of the hot products of combustion is illustrated by means of the short black arrows in Fig. 3. These gases pass into the combustion chamber from the ash pit, are swirled about in the combustion chamber through side drafts and cross drafts until the entire external Wall of the combustion chamber is heated. -The gases in their normal travel pass upwardly from the rearof the combustion chamber to the tubes 55 and into the rear of the inner radiator tubes; thence forward along the inner radiator tubes and through the bridge sections 53 into the outer radiator tubes at the front of the heater; and thence rearwardly through. the outer radiator tubes, whence they pass upwardly into the smokebox and out into the flue. These ases thus travel throughout a considerabl e length through the radiator sections, wherein a large proportion of the 'heat of the gases is imparted to the metal of the radiator sections.

In order that the resistance of the radiator tubes may not be imposed at the time a fire is being started, when all available draft is desirable, and to shunt out the radiator tubes to prevent the deposit of soot therein,'I provide the damper 60, which when opened gives a passage for the combustion gases directly from the combustion chamber to the smokebox. This damper 6Q may be controlled by any suitable mechanism, though I prefer that it be opened and-closed from the front of the furnace, as'by means of the rod and handle 76 and 79 heretofore described. When any one'of a battery of heatersis not .in use, the two dampers 59 and I the damper. 60 are all closed, thus completely shutting oif both paths for the combustion gases heretofore described. The two dampthe ba e 64, be deflected downward ers 59 and the damper 60 are preferably controlled by means of suitable rods 75 and 76 and operating handles 78 and 79 appearin on the front of the furnace.

The air to be warmed enters beneath the rear wall 69 of the warm air chamber, this air being either supplied under pressure by fan or being drawn in through the ravity flow created by the heater itself. he air then passes along a somewhat tortuous but general horizontal path along the combustion chamber from the rear to the front, it being understood that some of the air will travel upwardly along the rear end of the heater and thence horizontall alon the top of the heater; other drafts 0 air Wlll travel somewhat diagonally along the side walls of the heater; other drafts will travel diagonally u ward along the side walls, im inge y to the lower art of the air passageway at the front of the heater, so that all portions of the external surface of the combustion chamber will be impinged by the moving air in its general horizontal passage from the rear to the forward part. The air then passes around the front end of the bafile 64.- and out of the combustion chamber section into the radiator section, where it again takes ,a general horizontal course as it passes between, above and below the four tubes of the radiator section. At the rear of this section, the major portion of the warm air is ejected into the warm air chamber beneath the smokebox, though a small portion of the air may pass into the warm air chamber between the smokebox and the bafile plate 65. From the warm air chamber, the

air is carried to the points at which the warm air is to be utilized through any suitable conductors, forming no part of my present invention.

In order to clean the ashes and deposits of soot from the interior of the radiator sections, the cleaning doors 82 are opened, the deposit in the inner pair of radiator tubes being pushed rearwardly and permitted to drop through the passageways 55 into the rear of the combustion chamber. The deposit in the exterior tubes of the radiator section is raked forward and permitted to drop into the ash pit through the check flues 40. It will be noted that the arrangement is such that no inaccessible pockets are left for the deposit of soot, all portions of the radiator tubes being directly accessible from the front of the heater.

The ashes may be removed from the ash pit through the usual ash door in the front of the heater, or, as heretofore stated, may be removed from the end of the battery of heaters. This latter arrangement makes it possible to install and use mechanical ash removers, by means of which the ashes may be taken out of all of the ash pits without 18,

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neeara being. drawn out through the regular ash doors, thus eliminating the dust and dirt incident to such practice.

The construction as heretofore described provides means for concentrating all of the movement of the supporting members of the furnace along the top of the plate 20; thus obviating the necessity of more than one ovable joint such as illustrated at 31', making it less diflicult to avoid leakages between the firebox "and the fresh air portion of the heater.

The foregoing description includes many details of construction which form no part of the present invention, but which are necessarily described to carry an understanding of the features of the invention set forth in the statement of invention at the beginning of the) specification, and in the appended claims, it being understood that many modifications of these details ma be made without departing from the spint or scope of my invention.

Having thus described my invention, what I claim is:

l. In a heater, the combination with a combustion chamber of a radiating section mounted above the combustion chamber, the rear wall of the heater being spaced from the rear wall of the combustion chamber, means for admitting air to be heated into the space between said walls, a baflie plate "between the combustion chamber and the radiator section forcausing horizontal forward flow of air alon the combustlon chamber and a second be e plate above the till radiator section for causing horizontal flow of air in a reversed direction along the radiator section. l.

2. In a heater, the combination with a combustion chamber having an external radiating surface and a radiator section located above the combustion chamber and arranged to receive combustion gases therefrom, of rear, side, front and top walls inclosing said heater in a warm air chamber,

"an air intake for the air to be heated disposed adjacent the rear end of the combustion chamber, a bafiie plate extending from the rear and side walls, between the combustion chamber and the radiator section and terminating so as to leave a space between its edge and the front wall whereby air is caused to travel in a general forwardly direction along the entire side and top radiating surface of the combustion chamber before passing into the radiator section.

3. In a heater, the combination with a. combustion chamber having an enternal fadiating surface and a radiator section lorated above the combustion chamber and ar ranged to receive combustion gases therefrom, of rear, side, front and top wallsinclosing said heater in a warm an chambers a bame plate extending from the rear and side walls between the combustion chamber and the radiator section and terminating so as to leave a space between its edge and the front wall, a second bae plate extending from the front and side walls toward the rear wall and covering a major portion of the radiator section, said baffles serving to cause air to travel in opposite horizontal di-v rections along the combustion chamber and the radiator section within said warm air chamber. l

d. In a heater, the combination with a combustion chamber and a radiating section, the latter being. located horizontally above the former, of an intake for the air to be heated disposed adjacent the rear end of the combustion chamber, together with means to direct air to be warmed horizon tally along the combustion chamber and forwardly relatively thereto, and then horizontally in the opposite direction along the radiator section.

5. The combination with a plurality of air heater units, placed side by side to form a battery of such units, of means for connecting said units whereby the ash pit of each unit is connected with the ash pit of its adjacent unit to form a continuous ash pit under all of the units.

6. The combination with a plurality of tit air heater units placed side by side to form a battery ofsuch units, of a common ash pit for a plurality of said units, and means 1ndividual to each unit for regulating the draft for that particular unit independently of other units.

7. The combination with a plurality of air heater units placed side by side to form a battery of such units, articulated vertical plates extending across and between all of the units and forming a continuous back wall for a common ashpit, horizontal plates extending between units and forming top walls for the common ash pit between the units, said vertical and horizontal plates serving as means for separating the fresh air chamber of the heater from the ash pit.

8. The combination with a plurality of air heater units placed side by side to form a battery of such units, a common ash pit for all such units, a common fresh air chamber for such units, and individual means associated with each unit for regulating the draft from the ash pit through, said unit.

9. In a heater,the combination with a combustion chamber of an ash pit and a radiator section comprising a plurality of horizontally disposed tubes extending contig uously from front to rear of the heater, of a passageway from the rear of one tube to the combustion chamber, a passageway from the front of the tubes to the ash pit, and means for closing the last mentioned passageway.

l0. h'heater radiator comprising a pinldtl ldh

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rality of tubes contiguously disposed in a substantially, horizontal plane, the tubes having a substantially constant cross section, means for directing hot combustion gases serially throu h the tubes, and means for directing fres air to be heated along all sides of the tubes, the-path of travel of the air being substantially parallel tothe axis of the tubes.

11. A heater radiator comprising a plurality of tubes contiguously disposed, the heater having a front plate and a combustion chamber, the tubes being built of articulated sections and being adapted to provide a passageway through which hot combustion gases may be serially directed, means for supporting the forward ends of the tubes upon the front plate of the heater, and means for supporting the rear end of said tubes upon and in sliding relation to the combustion chamber of the heater.

12. In a heater, the combination with a combustion chamber having articulated side walls, of a pair of alined channel members supporting the side walls of said combustion chamber, the rear portion of said channel member being attached to and movable with the rear of the combustion chamber, and the front portion of said channel member being attached to the front plate of the heater, whereby the longitudinal expansion of the side walls of the combustion chamber causes the separation of alined portions of the supporting channel, said se aration occuring at a point substantially mldway between the ends of the combustion chamber.

' 13. In a heater, the combination with a combustion chamber of a floor plate for 'the rear of said combustion chamber, said floor plate havin channel shaped edges, side walls for the com ustion chamber supported within the channel shaped edges of the floor plate, sealing materialwithin the channel alongside the side walls of the heater, and a rod supported by the sealing material for holding the latter in place.

14. In a heater, the combination with a supporting channel having a V-shaped groove therein, of side walls resting in said V-shaped groove, and having longitudinal movement therein due to expansion and contraction, sealing material within the V- shaped oove adjacent the side walls, and a rod resting upon the sealing material to hold the latter in place.

15. In a heater, the combination with a horizontal combustion chamber of a vertical wall forming a partition between the ash pit, and the fresh air chamber of said heater, and a pair of channel members resting upon said vertical wall, and slidable thereon in response to the expansion and contraction of the heater, said channel members supporting the side walls of the combustion chamber.

16. In a heater, the combination with a rigid front plate forming a partial support for the heater, of a combustion chamber section extending rearwardly from the front plate, additional supporting means for the combustion chamber section located at various distances to the rear of the front plate, the elements of the combustion chamber section being rigidly secured to the front plate and movable by expansion and contraction relative to the foundations of all their supporting means.

17. In a heater, the combination with a rigid front plate of a combustion chamber section, and a radiator section, each extending horizontally rearwardly from said front plate, each of said sections being rigidly secured and partially supported upon said front plate, other means for supporting rear portions of said combustion chamber section and said radiator section, all portions of said sections, excepting those immediately attached to the front plate, being movably mounted upon their supports so that all expansion and contraction due to change in temperature takes place at other than the front plate support.

18. In a heater, the combination with a rigid front plate of a radiator section rigidly secured to said front plate and extending horizontally rearwardly therefrom, and other means for supporting rear portions of said radiator section, said other supporting means permitting a backward and forward movement of the rear of the radiator section whereby the front of the radiator section may remain stationary notwithstanding expansion and contraction of the section.

19. In a heater, the combination with a plurality of articulated front plates forming the fronts of adjacent units, a combustion chamber section, and a radiator section for each of said units, said sections being rigidly anchored to the front plate, and means supporting the rear of said sections for each unit whereby all units may be alined with respect to their front plates, and whereby different degrees of expansion in different units will be'taken up at the rear of the units without causing disalinement of adjacent front plates. I

20. In a heater, the combination of a combustion chamber, an ash receiver under the forward partof said combustion chamber, the under side of the rear part of the combustion chamber providing a heat radiating III bustion chamber to receive combustion gases therefrom, and arranged to conduct the combustion gases to the forward end of the between the combustion chamber and the radiator section extending from rear and side walls of the furnace to a position near the front wall thereof, and lying between the combustion chamber and theradiator section for directing the air to be warmed horizontally in a forward direction along the combustion chamber, and a second baffle extending from the front and side walls of the furnace to a position near the rear walls thereof lying abovethe radiator section for directing the air horizontally toward the rear of the furnace along the radiator section.

21. In a heater, the combination with combustion and radiator sections arranged to receive the air ofcombustion at the front, and to carry it to the rear of the combustion chamber, a conduit between the rear of the combustion chamber and the rear of the radiator section, the radiator section being in two portions, one for conducting the air of combustion from the rear of the furnace to the front thereof, and the other for conducting the air of combustion from the front to the rear of the furnace, of means to receive air to be warmed at the rear of the combustion chamber, and to direct it foring between the rear of the combustion chamber and the rear of the radiator sec tion, and means providing a sliding connec tion through said conduit between the combustion chamber and the radiator section, a battle lying between the combustion chamher and the radiator section, and secured to the side and rear walls of the furnace, the

conduit for conducting gases between the combustion chamber and the radiator section passing through said hams, and a movable gasket surrounding the conduit between the combustion chamber and the radiator section for closing the opening through the bame, said gasket providing relative movement between the baflie and the radiator sections to compensate for difference in expansion of the various parts.

In witness whereof, ll hereunto subscribe my name this 10th day of November, 1920.

EARL J. ELLISON.

Witnesses: ANDREW b. WINTJERCORN, ALBIN C. AHLBnne.

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