US1254142A - Dry-kiln. - Google Patents

Description

H. HUNTER.

DRY KILN. APPLICAIION FILED FB.x2,1911.

H. HUNTER.

DRY KILN.

APPLICATION FILED FEB. l2. |911.

Patented Ja11.22,1918.

2 SHEETS-SHEET 2\ 1 tel", and involves HARRY HUNTER, F INDIANAPOLIS, INDIANA, ASSEGNQR '1110v THE HUNTER DRY COMPANY, 0F INDIANAPOLIS', INDANA, A CURPURATIDN OF BEY-KIEM.

memes.

Spcification-of Letters Patent.

Patented Jam 22, 1918.

Itoplicattoriv med- February/'12; 191.7. Serial No: 1481124.

To oZZ- whom; t Concern:

Beit known that I,` HARRY HUN-Ten, a ottimo: ot" the 11i-ted States, residing at Indifanzqjolief in the county of 4lvlerion' and lita-ter ot' Indiana'I here invente-d a new and useful.Drydiiln. ot', which the Jfollowing is a' specification.

lhe objet-t ot' vmy invention is to prof doce e dry kiln for producing drying at a rapid rated. without injury tothe articles being dried. ther" devel-opment and iniprov'enient of what. is shown infm'y Patent No. 1,067,921, but omits sorneoflthe features shown in the latce-rtain new features by Whi rtho rafte ot' drying ina-y be materially hiere: greater flexibility of control obtzt-ined. accessi? The l:recoin[.nrlfiy'ing drawings illustrate my invention'. Figure 1 is a `vertical longitud-inal seotion through a dry` kiln ronstructed in accordance with my' invention, with sonriev parte broken away, und with some ot' the doors closed and some open; Fig. is a set'tio'n on the line ;-i ot' Fig. l; and Fig. Il is a fragmentary detail oi' the damper control-line4 the air inlets on eerh side.

It suhstnntially closed room or compartment is tf'n'roed hy end wells and d, side walls 7 and 8. e Ceiling 9, and a door fi@ all, of which are' preferably 'properly heet in- 'snla'tod` at least one of the ond mills heilig provided 'with a door 1l.

Un auch side oi? this compartment. and parallel to the side wall' 7 or 5 is a serios of doors 12, which are hinged at their upper edges to a, beam l?, extending down from the ceiling-r 9 so that they can he swung; either -to vertical position, :is-shown in full lines in Fig. or 4to horizontal position just below the ceiling 5.), as indicated in, dotted lines at the left ot' Fig. 2 und as shown at the right hond end of Fig. 1. lil/hen the doors 12 ere swung to horizontal position their free ends are supported from the ceiling 9 by suitable hooks 1.1. Each set. of doors 12, when low ered,A form with the associated beam 13 a partition parallel to but spaced Jfrom the adjacentside well 7 or 8, which artiton extends from the ceiling;f f) down tairly'elose to the floor 10. Directly below the lower edges of each series of doors 12 but spaced; therefrom is an open water vessel 15. extending the full length of the compartment and My present invention is a for the parts rendered more easily supplied in anyv suitable way with Water' yvhich is heated by steam pipes' 1G immersed 1n tlien'ziter in' such resseh'the water vessel 15 helng supported on a beam 17 resting on the ioor 10.

letweon each series ot doors 12. and the adJat'ent side wall 7 or S is a second series of' doors 1S,ivhiGh ar@ hinged at their lower edges to a beam 1t) extending np from the Hoor slightlyv beyond the upper edge of the waiter vessel so that they can either be situ-ng to vertical position as shown in full lines in Fig, Q, or swung downward to approxima-tely horizontal position overlying the water vessel 15; The normal upper edges of the doors 18 are provided with block-s 2U which serve to support the outer edges. of these doors when they are lowered and to space the doors 1S from-the doors 12 when both are in vertical position. Corresponding blocks 20 may be provided on the lower ends of the doors 1Q. The doors 1S, when raised, forni with the beam 1i) a partition l'mrallel to but spaced t'roxn hotly the adjo- 'cent side wail T or 8 and the partition formed by the doors i2, which partition formed by the doors .5S projects from the floor up fairly (-lose to the ceiling;` 9.

Illfhe doors 18 are spaced from loo'th the adjacent side wall or and troni. the doors ont are considerably closer to the doors 12 than to thesido neil. ln the space iletween the doors .18 and the side walls 7 or 8 is lorated a group of steam pipes 21, which. are supplied with steam in any suitable manner. Air inlet pipes 2:2 project in. through the lower edge ot' @ech side wall 7 and 8 and are turned upward et their inner ends so es to discharge upwardly on to the steam pipes 21. The inlet ends ot these air inlctpipes 22 are pro-vided with dempers 23, which maybe operated in the usual manner of dempers as is clear troni Fig. 3, to vary or shut oli' the. supply ot air through such pipes, the two dann/)ers 23 for the two sets of air inlet pipes on the two sides of the comf partment being separately controlled. The upper end of the space between the doors 1S and the side walls 7 or. .8 connected over the upper edges of the doors 18 with the space between such doors and the` doors 12, and preferably a curved battle surface 24h25 provided over the ripper edges of the doors 18 at the top ot lthe space between the side wells I or 8 and the doors 12 for turn-l ing thernsoendingmirrom .around the steam pipes '2%2'1 domineert] into the spare between :the doors .lrianfl-the doors `v112.

Air :outlet Ioipes 25 'projeet through the beams I7 un' '119 on `euch side vfrom the lon'erpart of'the central drying chambers, nml these pipes turn upwurd und are eurred-pus'tthe nupipes 2l 'into .n ldrinn :Qejleeated on euch y'eide 'in the up'ier part to of the 'since between vthe Asitlefwnli for 8 1:und the oorsll. 'Freni euch of vthese two drums 126, :a pipe-27 extends uviwurd either *tothe ntmosphere-or'to the in et kside of a suituhlyrtirirenfblower QSL-'counnon 'to the l5 ipes'v or `blu ruches''to both us shown, the ilonfer vtiliseliurging' u't Yany convenient .point to'flhe :atmosphere A butterfly vulve 'eontrolsftlre fconneetion from euch drum 26 `c'ireet Ato tlieeftinosphere, und u similar *vulve S B0 fthe connection from euch drum to the,

" is duplicated at both sides of the eonipnrhu lhlou'er 12S.

Tf -elesireh "there "muy also be provided e vulves 29 or 30 ure all ov en.

return 'pipes Sil-which ure interspersed with the"ourlet pipes und like the lutter 'pro- 1% eetthrough the heunfis 17 und 19 from 'the lower-peri of 'the 'central drying vchamber -:unilThurn upward into 'the spaces between Ythe respective siole -ufells 7 und 4'8 und the doors-12. The pipes 31, however, discharge v1upwelrfl'intofsu'c'h spree onto the steam pipes yQ1, 'uscio `the nir inlet .pipes The inlet ends vof the V,pipes ,S1 are proiided with dempers 3Q, fsinnier 'to 'ihe dempers 23, 'the dempers '2&2 'for the 'tiro sets oi? return pi )es 3i-5 *31 'onftle two fsilesfo'f the compartment einig feontrolle seperately from each other fanti from the tempore L23.

.In-operation, the hem of euch set of steam pipes l enuses the uirftorise in the feeding 40 spafeehetweenthetlo'ors 18 andthe srle well 7 MUS,4 rawing 'n air from `the utmosphere .through 'ilrefnirj t'pipes 22 if the dempers y.93.seheripennuitroniftilremein llrying chorus `heritino-ughilseinstruir; .pipes 3i if 'the dem ersnre'opeu. 'Thisfmr heated or re- L pesses `ups-urti over the steam Vel 4when fit renehesthe 'top of 'the eontuiningfsueh nipes 'russes ieper edges cuiv "the oor l -iind 'tl wirough lthe "feefling spese he iQ-nnufthe eloersli. 'When ottoni of 'thi'slutter specie, it p'a eloweretlges of the'do'ors 12, until te 'e trol friug e'ouipurtiuent hetween tico oi? oorfs {3112 anlwhieh e pieuse henrtieles'to'he drie' "the t hen et?! fuir epesses i'unifier fthe lower of itheioorslyiitlt 1 heiilteilweter in 'resse-Hom @heroines uinilliie'dtherehy "i @towfileiiniteextent,'epeurling-upon'thetem #this sir.`-` uteriiiligvu" lsnithervingreni enuiiles it' to ltulee fp nee more "quielzlr vunil ut 1% Je higher then-it 'the air *were not humidiiied. The air circulates through the drying ohu1nber, to produce. the desired drying., and then passes out ut beth sides through 'the return pipes 31, Vfor rehentng vasset o'rtlud or through 'the nir outlet pipes im 25, which curry it to the drums :26, whence it passes by the pipes 2? to the utinosphere, through the vblower '2S or not. uocordm' Yto the setting of the vulves .2l und 30. he hlower 2S muy be used to produoe n forced '7e Circulation when that is desired; though for most dryin' operations the 'oireuhrtion vis rapid 'enougi without operating such blower, for n naturel cirou'lntion occurs by reason of the heating effect of the steam pipes 21 not only on the incoming uir from the inlet 'pipes 22 und the return nir from the pipes '31 but also ou the outgoing nir in the pipes 26.

The circulation which has been described 35 ment, if the dempers 23 and 32 und the. However, the circulation muy be modi ed hy closing either damper 23, leither or both dempers 3:2, eiher so or both valves 29, either or both vulves 30,

or some combi-nation of these. Thus if one damper lQ3 and both dempers 32 ure eloser while the other damper 23 nud lboth wives 29 or 30 remain open, the air enters utone e5 side, circulates throi'igh the dry-ing chamber, und leaves through the plipes 25 ut both sitles` passing to the utmosp ere either. direct or throu h thehlower Q8 according to whether e it is t `e vulves Q9 or the rulves '30 Iwhich are onen; there is no rehentng et the 'nir in this arrangement. Corresponlinrgly, if one valve 29, both vulves 30, ami hoih Kleinpers B2 are closeri` while the other vulve Q9 and hoth dempers 2B remain opeur the oir enters at one side, circulates through the drying chamber, and leaves through the pipes v25 at one eine only, passing to Ythe etmosphere without. going to the blower 28; there-1s also no rekening of the nir in vthis 'nrren @menti In the arrangement inst de scribe ,e forced Veireulntion muy he obtuin'eii hy fthe'hiewer 28 by closing the open vulve@ enti 'opening the velue 30 in the seme pipe 'Qh It one rlemper 23, ho'th dempers 3% one vulve 29` auclhoth vulves BU ure elosei, while thel other demper Q3 unil the yother valve 29 renmin's open, ell the nir enters ut one side mi leaves et one eine, the side of entrrrnee und the side of leaving heling either thesnme side or opposite sides mourning te which of 'the vulves Q3 und whieh of "the 'vulves 29 Vnre -opeiu Here `also is #no relientingsn ns 'before e ftoreed circulation instead of n naturel eiieuluiion :my 'he ohtuined yheitere oiosiug zche vulve 29 unil opening the eorresonciiug vulve et). ly opening one 'er hot vileuniers im some et the nir drawn r'from the neutral ehiuni-ier is Y esrriecl vugtuu over the 'pipes im eee re no Mil l 'ab 'bach into the drying chamber.

League heated and 'then carried `hack to the drying chamber. This may be done on either or both sides, with fresh air -trom the atmosphere being drawn in on the same side or 'sides or not. Fori-nettime.. by opening the damper Q3 on one sideonl and the damper 82ml the other Side only, iresh air is drawn in on the first Side, and a'ir from the central dr ing chamber' is drawn out at the other si e near the bottom and retreated and sent Other modiications of these arrangements may be used by di'ie'rent arrangements of the valves and dempers.

'By using -pipee` 2l for vheating air entering -at hot-h nides..it is possible, to obtain a velv cone'idcrably higher dry-ing tem perat u re which may be Still `further vaised by reheat'in'gt'he air drawn from the bottom .of

the dryin chamber through the return pipes 31. t is 'possible to use this high dry lng temperature, by reason of the humiditying of 't 1e air'by the. water in the vessels 17': and eert-ain eects can be obtained by this 'higher temperature which are not possible at Ilower temperatures. The damper-s QF and 32 and the valves 29 and 30 provide an absolute control of the amount and direction of the circulation. The 4hinged mounting ot tl'hedoore 1Q and 1.8 rendersthe steam pipes -Qlfaoceseiblta for cleaning and repairing. In

-eome instances. one set of air inlet. pipes with a niet. of steam coils, or one set of air o'itlet pipes, or one or both` sets of return pipes. or 'either the-.direct discharge. to the atmosphereor the discharge through the 'blower torforced circulation, or several ot' Y these.. may be omitted: but in order to make oeeible 'a higher dryin temperature l p re.- ler to have bot-h sets o air inlet pipes with their steam ipee and 'Water pans even thon -h other eatnres be mnitted` I c aim as mit invention:

l. Adry kin. consisting of a main or outer compartment havin-g a. `ceiling and Weile. a partition project-ing downward'i'nto Saldlepmpn'rtnient near vone. wall, a. second partition proj;eatingu upward between 4said rst. '.-aartitalon and fthe adiaeen-t wall. sai-d g a rti'tioin being respeotively vs aced from the o'or -a'nd :the 'ceiling of sait compart'met'it and the two partitions beinp; spaced from each other and from said wail. heating means located in the spa-ee between .said eee and partit-ion and the adjacent wall. said "space being proridetiwi'th an air inlet open Vat the l )ottoni and said compartment. be 'ing provi-tied with an air outlet opening. each saliti vpar't'i'ttms consisting oiV a plurality of doors, the 4door-e oi? the partitions nearer 'the adjacent wall peine hinged at the bot torn and those .of @the other partit-ion being,t 'hinged at. the top.

i2. A dry kiln. consisting of a main or outer compartment 'having a ceiling and walls, a partition projecting downward into said compartment near one wall, a second partition prolectlng upward between said first partition and the adjacent wall, said il. A dry kiln. consisting of a main or outer eomlmrtment having a ceiling and walls. a partition projecting downward into said commitment near one. wall, a .second partition projeetinttr upward between said first partition and the adjacent wall. said partitions beingl respectively epaced from the floorand the veiling ot' said eonipart nient and the two partitions being Lspaced fwn-nraeh other and from `Said wall. heating means located in the spat-e between said second partition and the adjacent wall` said spare beingl provided with an air inlet opening at the bottom and said colnlmrtluent beeach of said partitionV being' mounted on hinges. the. hinges for the partitionA nearer the adjacent wall being nearer the. bottom of auch partition and those for the other partition being near the top of auch parttion.

el. A dr)v kiln. -onsistingof a main or out-'er compartment having' a ceiling and walls. a partition projecting downward into said eonipartinent near one wall. a seoond partition projecting.;ir upward between said `rst partition. and the adjarent wall` said partitions being respectively spaced from the. floor and theeeling of. said rompartment and the two partitions being: spared from ing' provided with an air outlet o]:)ening.f

each other and from said wall. heating means located in the spa-ee between said eee;- ondi .partition and the adjacent wail. said npaee. beine` provided with an air inlet opening-at thel ottoni and .said compartment bei'ng provided with an air outlet opening.'

ret partition and the adjacent wall. said partitions l'ieing respeetiveli,7 spaced from the floor and the ceiling` ofsnid rompartment and the two partitions` being spaced from eaeh other und from said wall. heatingmeans located in the spare l-ietween .said .second pa r -tition and the adjacent wall, said space be ing provided with an air inlet opening at Vthe bottom and said compartment being provided with an air outlet opening.

6. A dry kiln, consisting' of a main or outer compartment having al ceiling and walls, a partition projecting downward into said compartment near one wall, a (second partition projecting upward between said first partition and the adjacent wall, said partitions being respectively spaced from the fioor and the ceiling ot' said compartment and the two partitions being spaced from each other and from said wall, heating means located in the. space between said sec ond partition and the adjacent Vall, said space being provided with an air inlet open ing at the bottom and said compartment being provided with an air outlet opening, and an open water vessel located under the lower edge of said first partition.

7. A dry kiln. consisting ot' a main or outer con'ipartnlent having a ceiling and walls. a partition projecting downward into said compartment near one wall, a second partition projecting upward between said first partition and the adjacent wall, said partitions being respectivelj7 spaced from the Hoor and the ceiling of said compartment and the two partitions being spaced from each other and from said wall, heating means located in the space between said second partition and the adjacent wall, said space being provided with an air inlet opening at. the bottom. and an air outlet pipe extending from the lower part of said compartmentthrough said second partition and up through the space in which said heating means is located.

8. A dr)7 kiln, consisting o'f a main or outer compartment having a ceiling and walls, a partition projecting downward into said compartment near one wall, a second partition projecting upward between said first partition and the adjacent wall, said partitions being respectivelj7 spaced from tbe,floor and the ceiling of said coinparts ment and the two partitionsA being spaced from each other and from said wall, heating means located in the space between said second partition andthe adjacent wall` said space being provided with an air inlet open ing at the bottom` an open Water vessel located under the lower edge of'said first partition, and an air outlet pipe extending from the lower part of said compartment beneath said water vessel and through said second partition and up through the space in which said heating means is mounted.

9i A dry kiln` consisting of a main or outer compartment having a ceiling and walls, a partition projecting downward into said compartment near one wall` a second partition projecting upward between said first partition and the adjacent wall, said partitions being respectively spaced from the floor and the ceiling of said compart ment and the two partitions being spaced from each other and from said wall, heating means located in the space between said second partition and the adjacent wall, said space being provided with an air inlet opening at. the bottoni, and an air outlet pipe eX- tending from the lower part of said compartment through said second partition.

l0. A dry kiln, consisting of a main or outer compartment haring a ceiling and walls, a partition projecting downward into said con'ipartment near one wall.y a second partition projecting upward between said iirst partition and the adjacent wall, said partitions being respectively spaced from the floor and the ceiling ot' said compartment and the two partitions being spaced from each other and from said wall, heating means located in the .space between said second partition and the adjacent wall, said space being provided with an air inlet open ing at the bottom, an open water vessel located under the lower edge of said first partition. and an air outlet pipe extending from the lower part of said compartment beneath said water vessel and through` said second partition.

1l. A drj7 kiln, consisting of a main or outer compartment haring a ceiling and walls, a partition projecting downward into said con'lpartment near each of two walls, a partition projecting upward between each of said first partitions and the adjacent wall, said first and second-named partitions being respectivelj7 spaced from thelioor and the ceiling of said compartment and the two partitions near each wall being spaced from each other and from said wall. heatingnieans located in the space between each of said seconduiamed j'iartitions and the adjacent wall, each of said spaces being provided with an air inlet opening at the bottom and said compartn'ient being provided with an air outlet opening.

1Q. A dry kiln, consisting of a main or outer compartment having a ceiling andA waiis, a partition projecting downward into said compartment near each of two walls, a partition projecting upward between each of said first partitions and the adjacent wall, said first and second-named partitions being respectively spaced from the Hoor and the ceiling ot said compartment and the two partitions nea-r each wall being spaced from each other and from said wall, heating means located in the space between each of said second-named partitions and the adjacent wall, each of said spaces being provided with an air inlet opening at the bottom and said compartment being' provided with an air outlet opening, and an open water Vessel located under the lower edge of each of said first-named partitions.

13. A dry kiln, consisting of a. main or MLS `:from :the spa-ce on the other side of said second partition. and .said `coinpartaient. .be-

provided `with an' outlet pipes.

A drjfr kiln, eon-sistiner of la main -or oiuter compartment haring a ceiling and walls, a partition projecting downward into said'compa'rtment near vone Wall, a second partition projecting upward vbetween said first :partition and the adjacent wall, said 4partitions- .being respectirel)T spaced from :the vitloor and the Sceilint.r of said compartment Aand-.the two partitions being spaced from each lother and from said 4wall, heating means located-jin the space between said second' partition andthe adjacent wall. said space being provided at the bottoni with air inietopen-iims botli .from the .atmosphere and :from the space on the other side of said first partition, and said conipai-traenty being pro- 'ridcd with '.air outlet pipes, and an open vwater vessel located under the lower edge ot' said'irst partition.

.1127. A 'dry'lrilin consisting .of a main or outer compartment having ya ceiling and Walls,-.a1partitipn projecting downward into rsaid compartment nead one wall, a second "partition 'projecting upward between said first fp'artition'and the ,adjacent 1ivall, said partitions :beingr .respectively spaced from the l.floor and the ceilingr vof said compartmentand the .two j partitions being spaced -fromieach other and from said wall. heating means loeatedin the space between said second vpartitionrand lthe adjacent nia-ll` said space' being rprovided at tilie bottoni with air inlet openings :both `from 'the atmosphere. and .from `the space on 'the other side of said second partition, :and `an .air outlet pi-pe extending from 'the' *lower part of said corupartment'tllrougli said second partition and up through the :space vin .which said hea-ting :means is located. l'

28. A dry k'iln, `c-'cmsisting of azmain or router compartiment having a ceiling and Walls, afgpartitionprojecting downward into said compartment :near fone Wall, a. second :partition 'projecting mpward between said tiret jpartition and the :adjacent wall, :said partitions @being-r respectively spaced from 'thei'illooraand v'.tlie ceiling .of said compartiment and the two .partitions being spaced from eachother and vtrom said Wall, heat-ing `"mean-s located lin 'fthe space between said second partition.' and at'he adjacent Wall. .said

espace beilgproliled Lat vtlie"iaottoml with air inlet openingslaotii -tromltlieatmosphere and i-rom "the spiace @on the-other slide o-f said secment Enough said lpartition.

' .Q vdif-gy.lil'n., `consistir:14er"uit main or enter l1com partmsei'it drawing ra fceiilfiuaf and walls, :a partition-projecten@ ilrowInward 'into said compartment 'near each of vtwo Willis, .a partition p roj ecting .upward 'between each of .sa id tiret partitions. and the adi ace-nt mali., said first and second-named partitions .being respectively spaced 'from Til-1e .and the ceiling Aot sai-d compartment and the two partitions near each wall being spaced from each other `and from said Wall, heating means located inthe .space loot-Ween eaeli of said secondmamed partitions andthe adjacent Wallfeach of said spaces-being provide-d with an air inlet open-ingV Itrom the atmosphere and an air return opening from fthe central space beyond the. associated-partitions, and .saidcompartment being `proded i with an air outlet opening.

30.` A dry lri'ln, consisting ot' .a .main ror outer compartment haring a ceiling and Walls, a partition projecting downward into said .compartment near each of two walls` a partition projecting upward between each oi' said Afirst partitions and the adjacent nalL said first and secondnamed partition-s being respectively spaced from the floor and the ceiling of said compartment and the two partitions near each wall 4'being .spaced from each other and from said Wall, heating means located in the. space between eacli ot :said .second-named partitions and the adjacent Wall, one of .sai-d spaces being pro- *vided -with 'an air inlet opening 'from the .atmosphere and 'the other with an air retiirn opening from the' central space beyond .the associated partitions, .and said `eo inpaatment being' provided with an air outlet opening.

3l. A dry kiln, consisting .of :a main or I outer compartment har-ing .a ceiling and Wall-s, a partition projecting downward into said compartment near each of tw@ walls, a partition projecting upward 4betweeneach of said first partitions and-the adjacent wall,

said .first andsecondna-ined partitions being respectively spaced from l the floor and the ceiling yol said compartment .and the two partltions near each Wall -being spaced troni each :other and from 'said avail, heating .means located in lthe space yloci-,Ween 4each of lsaid secon-d jacent We @named "partitions :and the adfeacli -D said spa-ces being prolvided with :ai-r .inlet opening from the atmosphere vand an vair return opening from 'the central space beyond 'tile associated partitions, and Asaid .compartment bei-ng ro# "vided with an airo'utlet opening, and Vai ves controlling :the vair low through the several openn I' A kiln, uc msist`m,1g; of .a main or .outer compartment haring a 'ceiiing and walls, la 'partition projecting downward into said compartiment near each off two Walls, a partition .projecting upward -zbetween each of -sa-id .first partitions :and the :adjacent wail,

said .and .second-.named partitions being respectively spaced from the oor and the ceiling of vsind compartment :and the two partitions near each wall being spaced from each other and `from said wall,l heating means located 1n the s ace between each of said second-named partitions and the ad` jacent wall, one of said spaces being prom vided with an air inlet opening from the atmosphere 'and the other` with an air return. opening from the central' space beyond the associated partitions,and an air outlet pipe extending under a second-named partition and up through the space between that partition and the adjacent wall.

33. A dry kiln, consisting of a main or outer compartment having a ceiling and walls, a partition projecting downward into said compartment near each of two walls, a. partition projecting upward beyond each of said first partitions and the adjacent wall, said first and second-named partitions being respectively spaced from the floor and the ceiling of said compartment and the two partitions near each wall being spaced from each other and from said wall, heating means located in the space between each-ofi said second-named .partitions and the adjacent wall, each'of said spaces being provided with an air inlet opening from the at mosphere and an air return opening from' the central space beyond the associated par-V titions and an outlet pipe extending under a secondnamed partition and up through the space between that partition and. the adjacent Wall.

34. A dry kiln having a ceiling, walls, and intermediate partitions, forming a main drying chamber and two feeding spaces, said two feeding spaces being on opposite sides oi" one of the partitions and being intercon-y nected at their upper ends and one of said feeding spaces being between the other feed Lemme ing `space and* the main `obeyingl chamber* heating means in one of said tee @Eng spaces.,

the feeding space in which seid "heating" means is located, beinor providednear its lower end with an air n1 et openingtrom the atmosphere and a return air opening from.

the main drying space and the lower end, of the other feeding space being connected to said main dryingl chamber, humidity-ing means in the connection between said last named feeding space and the main drying chamber, and an air outlet pipe leading fromv the lower part of Said main drying;`

chamber upward through the feeding space containing the heating means.

35. A dry kiln hayinga ceiling, walls, and intermedlate partitions, forming a main drying chamber and two feedingv spaces, said.

pipe leading from the. lowerl part. of said,l

main drying chamber upward through the feedingspace containin the heating means.

In witness whereof, have hereunto set` my hand at Indianapolis, Indiana, this ninth day of' February, A. D. one thousandfnine hundred and seventeen.

HARRY HUNTER,

Eagle: of this patent may he obtaine, for, ive centsP each, by addressing the. Commissioner of. Intente,

Washingtem n. 0;

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