Document J3e3M04YdGEK7YVrz66NypNOa

FILE NAME: Visible Dust (VDT) DATE: 1933 Aug DOC#: VDT003 DOCUMENT DESCRIPTION: Article from Trade Journal - National Safety News N a t io n a l S a f e t y N e w s PuIiIisfictJ liin a llily in ific ialeraB o f [ircv rn lia n a u d tile h exltii o f in d w iria l w oritcrs VOL- X X V III. N o. 2 CO N TEN TS fo r A D C I ST. is s n We Can`i A dvance W ithout R ecord-/. L. PtUtdegrtf................................ > vy^j,, -P erm issib le" M esns in R espiratory Protection-- W ii/iacn P. Vonf . -- 11 I.:0o3vcrinir the F ife H a ia rd r--- f. IF. l a s t ............................................................... 33 I'a v t th e S raaii P lant T ao-- K ith cn L. S i'h m itt . . . -------. . . . . . . . . . . . I & iL m d liti M ilc tiil--A R eal Problem [or the S afety Man--J. A . 1'iuAv . ------- IT Fscing A c F u tu re --AS. A . G ita h e i........................... . . . . --------- . . . . . . . -- _ j i 5 Mechanical Control a t G etrupadoesI Disease-- D avid S . 3 e y e t .......................... 23. An Eye S aved--S te v a r t J . O m en, / r ..................... .......... ......................................... 23 Sound O bjectives fo r th e V ocational School--John A . M cC arthy . . . . . ----- . .22 Tbc Congress R ep o rter -------------- --------- . . . . . ------. . . . . . ---- . . . . . . . ------. . . 3 ? nEron C hildren R ide to School S a te s-- C a rtit B iS ia ttt . . . . . . . ___ . . . . 2 9 HiecttieShock- u td B urns C use Much L ost T im e ........... .................... . . . . . . --36 R egular D e p a rtm e n ts 14- ut it. M - u o e i1ih j. l*.o Tier Mfci'&r Cusaaase Ese'ibS'*. 4* ISar Vi efer M=sS^33SsSff=9 .VP "Ifer l!asi."ii ffcajia*! in Tfoer Ssvunwr LtsfflAK T. Fish. Editor G. M. B u c o . A ssociate M i n t S taxixv H . KkssHAr. Poster Editor C~ H . Mm t ps. Advertising Manager |a<np>nbi 1M3 uy }iaw l Mf 0 h r t i lae. t*H4 to I j U . IW h * -i w f2.t i,r?l M. >.O&toMUraafuSJ-awaker1y a1^31. Ml llw f*wjrsii(rf^flbvai 1H, u 4 r efc-r TR -taP^e-s.irjoKtaK, g 9a?a-dB=&-^Ta- 5W* -Kf&ff-Ei <ltoJ"Z**;'<"WFT'lDrTOgSc n>3TS4MeS&SMlsrtraSvttsfct^.^l.a ^ SLVFfatAgAL FW T pSTsM-pi .KT y<napU'* BGa8*w3$> r f e-fesar a-B<ra taiKSSa.ijAsv iesaSa' B ra-Bol)emG-i W B&ip JCdSicafisiibp*r~y t'e*sBja!sS. Si^ioc-p Asser aziTMsua a t CZnssslsalh&s^ TWt* m**** fu talea la to- tniM4Hk *ra I ttin . Sseteiis^ees! ss*& e oro / **'! a^raat^ii ta^ He *l*4rd hw! aire % fessai3G-rsvA tni 3fhs= NLnU-x-naS fe|csc- <?*se*F>s& 1 e? Insilrldosl N a tio n a l S a fe ty C o u n cil. In c . idrec.^gSs^isrf'iES' -ViosaM-ps^saeorr, avi twva./fc-a-j >-&Twh 20 h ^ at4c^ BrWi'. f lUitT4gr. . T~ PSe^ot ng-%. 9 KsaM 4?SS Ssrea- National Safety Giunci Oflicory- 1932-1033 &, atnJ*****, I"*- ----- Sfctas=2ae>P J /UtoS. ^ PC'u.UCUrl*SjraeMa*T0 VtaP-9,wiarar-itw ^ir iz&- , S>B1 Jo. Tt SSa-AS-fcrtrm- Tlir^rcT^i-si^i f#r SasiiHSbLaos^s*, 6r 5in=. -----XI* IL W- i *"fe<=sa52?Ai3&&i*a law. Caura fL W*m i . rkT~^riAen& Alf(lSM6' rSt f^).iii%5\"XSFnBSV f.va- K4im>|1on WW."W8Lf#>vwatpA5aM,JTvWm^^v ^liMS jyi^siaflsoME am - Ex**cn IVO. C n i t n ! s t e r 'ifi-w iim al Ceafrpf JK.si^2joai-iofcSOitw.}.MtfSEsef.taABiaWsEMeoi fCnai5W=THuaUS-d*' *JS.L a.*wc^ 5aara2^l?S 8E-7'r-&^r-' ICess^ \. Ttk*JG^a, iatlo- Icowati- Bcstm*'aaswi3.=3t!_ Tiw- Sia^Sa-S ^fefStLic1aX4*8eB-^fS^ SSsaMsfihffio?!!^ ffeiJ-Bo'twtt^hy ffes&nttn9+**.ep.jara.t WSk,. AG-aas,,ur6*=*=?-. . E# &g&Sl=Sfc tSL&SSBa, -Sfe>!ze, CJl.MT-vT UAtsdn^U.a>Mgn.^TlQ--akPudffliK^WagiikS*l&ac*?1-' * Al3nHpoW UaUrwMi Os_ i>SSs?2 LMk gawi ^X t a n n a . 9W R * iKb.^g4jBSMBS.|'uSTfeiit <& SrSifAw!^ CHnIotf.CtmL wHi,iwHmmo.UliaiIwonqi RalMiirmfri.aCa. A*wn M. T*^. -waUIbac 3lrme Aw frm~ .rU* Rr HI'IJ.-Ma .iitv'akv.dAifrWSi rrtm#ta. -feEe{iK4ieT=jrrE^V*, TW^S2av4r?.sw3e\r.^ Bfewwo mn.i C .L ^ oWsoSt.e5stsoetmtrn.p Y?"Wb>rirAr^-Mriltif^vlj IL U wic9-t'c,,rAa.wVoaa6a*^ MiiBus&skcana*. W i^ r t, ii<*_ ff2ra3ua>a. Ili. IL WvTeo. HV^c=-cse=.xItecadt^traQ-feWftSBtS L 1- Cr- &w LfL'T^aosa. 1 ^aa^eFe=K?*28l i ^ Ss^isiip \ L MS-LraKrr#.titaaL. lie OQlb ATu4r.nSi-8JtLaBb, fwiMfias.eSHia*ait2es*c RSLTIL. 6SiQaes,zAasAL3SUidi>^i!*<9Sv'StawawseOsss IVtf P w aiW ei .^SOfl-B T. a&f*LMaKmTaa, JiCarAV-sa&VLaSaw*:&KagBgBflatWiK* OHutaumpooisat2sPRa "Kf*A2JBimAa'r .ito^w6Ta IL Tsffisa b^A.wewui*JLA.atS^isf'ese' sa BL'aoAaa3A4B. .MICLK$L0** ^'a6.W ti, Scsbc sL^noo~a0.blJ.SaSKSSWe'A,, * ,,=<8*.'Bfcj`i,skaieoSltls^Tgna>^tn9o Sla5fl3a?rar<!" 6^-v IV. iLaWtwsaEj. lJ*oafxl*ax^ibsae?pn? flfisd# ^ StTB-T# J f G bfli PLAINTIFF'S EXHIBIT `v NATIONAL: SAFETY N 1933 t 'C U ST . ------------ -- i - --------------------------P ^ T r T * T \W7 T lie M e c h iiiiie a i C o n t r o l o f O c c u p a tio n a l d is e a s e s By DAVID S . BETEST" TH E aitCbaoicL.` control ai ia tesu ia l dir*ie o n to be roderei a S l ^ w I r in a tiej*e arsiefc; sii '*< %An q v I rtu is SO (ouch uptSa a iw -a (in' tiup-ctant points efieotsotenri l>r :-v ;ians managers rtoo are etrxssfiflp Mth sfc- problem w Jay. ris.-!- je" 04*tor Sony differem dEses#ri ,,iu-tab-d >n the corapcssatiSB a s s of varan American iMtfes: is ifstsa - ,,-sviiS- f 's n n c c t te u t e n d sewera (her statrt' (bere is on definite S of s&sssfs hat a r e firfn p c n s a te d , b i n th e s e marsAi juv catiiWer! *S " petsaeal icjfieT itnikf the Saw and csnjpeassiia h $oird a t e - a ; sa y spcci&e scfasdafe s ( mar*- Many of these dfeeasgg e of f" i m n r a x . Probably mossi of m ttuistde K m ed ia] jno fessea have n m r M heard of " C!obd s Ramassi** i African feosseoad) n "nroe^s syssssj- nius." which appear o a sam e of the state lb**. A half tesai o f She more iirr Itrr30t d isu ses, bow tvtr. vnB probable ..n rr n inny percem of the se a l fsty- ntm tJ '-fas marie d m h w b n n iedtsaty * tm a iiria ! ffisessrs u tsy. A analysis of appnodcaatrhr SSU5S0 o! ra n insaamnee e m p s q r d e e J serfral motfcnsnril r t u m e m t o sad Ealltly WsiaRSft, far reerai K.Sriaf disease (Sam s, rtiewed S4 pgr cent for r a s a ia w lsin poetanoccariasi iiorlud- silicosi, a t b e r t a , a c 3 21 per cent for lead fsoiaurunji, 9 p e r cent far various d e rm a titi 3 fxroeet iwhmsoL f "ri tin- rem aining 6 p e r cent ta r scsKcrfotJ -uses scsefe a s scna WHoside. rarimn m rachloride. chrome ami chlar- 0j*a , will .icc-ordingiy- l o s t a t tise sub- -1*0 fresm th e standpe: erf these few i n - P"r u o i causes. bssriag in Sud that the tost ap n rtaai n; 2 t t csrcassd by the scierai he*diets o f poBKsfteenksife. or ra e srd by d o . G these des- ^>'v- fhv rasi^j serious corns from tnhai* *'1* a intinri in sand. jrrsnite d m . 1 'r-11 - | s n lr r j. W ------- 9SW? S^h*Sl3'hi=fleSVn Sito- ili"*- "eat-- r,ev f iw Viosvra * Both th e m gisser xnd tltc physician ir e aeed ed in protect in g th e h eelth o f she worker a 4 th e p ock et b o o k o f tile eiip layer. In this article Sir. B eyer presents the cnginecriltg sid e a f t he problem . In site J u ue issu e D r. V \ Irving Clark dittcuased it fronts th e p su u t o f v ie w s t f th e jiliyririan IVhca ibv su b jft est d SnsmSBUned m on o f u t pm lnbly chink, of esslhle p#(sktei. le I t a , mcteh qI se ois rem a n i cork, n n by compattici tp r sU ista loss tk U&e la the p * h S i Sieste dircledi this f a r ss? Suss- M edal teaarefa h sSmvn m . howw , th a t te d u that k eeyst den^erous. thragh it i ecp g thahtiac a n o lite intqn is 3 sanili th at the ifldMdcs] p at- sides ire invisible and a m oaiy *oe seen hy- the naked eye if they arc-'gaih-! & a dense dotd, ssiticji may h aw the ap pearance of * (pay fojt U> are told th at the apmum s f d o st fuuad m the longs of n tin m trap harve <fed i^ ~ (iinri> a to u t l p i n t ' , i r H m uiuanly fail an agacr -- rfm a r a attfi to SIS a (en-eem sotte-auitt bottle. M irroecopk: M enssss Saffiei&a *d ihe peui^rta of e s is a ia g such iofimtestmal fiin id es n a y be hod when we fe n h e r leant that th e s U sa n eaataia mans JO m3do istlSoa p ertid o t ssa*y of thent a m best the xsse ef ih r tin y globtries af^Ucry ntsb- slanee that make p tigasta nroke, that . libimi s hm t& z thotostoiSiSs o i so. indi in dm eicr. i f they trete equipped with less they esssM m ards fifty aimrast (htoosh the iwUaw cem er oS a ham 5 if.' So lin k has the se risu sa m af this h a a rd te appreebii! ia she past shat It. is sot enueoaon lo pts into a pinot and find (our ar five tees of this fine d is i rhkh h3S flesled A lise sit hod Settled no the Tif ami / rrhead s r a n e r n f he buinc. lie- m ay l-e dfcJastged be gust? sj! air ,u %-ira- skss from rasawng cranrs. etc. If oac *ii-> 'StH* 'lr*(K^*inr- " - - I ?ofc* to l^&re tw' fs^say b sks& -siFfi ssia&slcgffd pO&eisisaHlI^ isst a aw C&PsaF3dX&S2t&|, ss Tir fim n o d is is s d rid of these unueec SKjr is a in u ilu n n s , xnd (hen a y to pc veoR^hdr recatreace. M ait? &ptsms matoafier riH ssy, "t i l I s t e i D (be tfoable end espesae acec m if 'm ateis tb s ite t wfese, fe tao cttci. il isn't earth anyiMsg alter it a a p ? ' T h e answer is th is h is jbeu to ^end th e money and effort in g tu h rid of the dust tb sn to be oveevritlelsti hy occupaiional disease djum s, asjis ti ease with many isrfustrial concerns 1 flay. i Sc sum strit<>n where (hen? k a S ended " diiy'~ rwle rn^sluybiu oc about 2000 itstt nn aa aeaaaS has ih n e have (sees 91 oeespatioeal t sses efaisas during the l a s s . avaSahle fiv yesur perij fAd o f tfcres fese (feath pcnuarsmi total disauuiiy with cdot bhtsd iiascs of neatly S3000d. In m e mdasstiTcs the cost of bull tri#l tfisase is s u e four or fate tin th a t tsi ai] other industrial acrid r a is b M . M m y ea sc a w that to serious aecupatitKv!. disease faaaardi < (ending over a period o i years l i ihcussekTa virtually im tasunbte. ! esnse o f th e heavy liahUlty for |cUu that has bees built op a t the result pass espesuig. A M i s t i e r t> S e f f - P r e s e r v a j j o r It f d l a n , therefore, that as a n w a t teU-pteretw k m plants ia tiiese rfusiri^ must an iia s w la id ;' a r p r e iiflriie peoeram nf improvemcni * will at least rheet the deveiepmeot new casus* 1 general, the mem reliable I .M e d ia n ><"" 1 C im im i o f <'rrtifi3lio*`I D if p a ie s < fU h H V *`t tram pt1 ( 2 2 J m / V - - . f m 'lSi, aAArfiam*sm TO WEAR OVER GLASSES II ysw ba-s^ W *=Sf? gfcauS fe<Sa ss ab4fe&S S9BBsace l ^xe ^bk9^, 0^23 a c*dl a s*3 *is&3s &$? |s&sjsyg dfcffSsa s=^as- ^ C O M ^ ov^s' ab^ p>Fripa$ga &85ies& T&ss- r ^SD &* fear fffc aiw ocMm* ffacSa a? s? pWtKflNf., CESCO M AC L C ^C <52_S m fqjwtriaily asa g^ssrassafj h&oetkam aste! ^Imffag t>f <te^g&= saw kgas@&, CESGD M L GOCMiLg^ fi*e finrabfe s sfc* Bsyk 8esaKg saasss^ esur -- - V*iitai*d sm u ra btsxd w*h SgW5? &? to t* * upxNBa gnacSflUg saaalfe fcQc zfsg s& li&* $raiao. ses ssfc<fe8 M kh S a p v Sfr far--.. VaUUf'i j m m fa W *4*fe OE oe >?EL 1 ir 2E5^m yeldlffig fisfcs eraatfea^. S%e8? for ajfiw^s- rat? <?tf<23&ag C H IC A G O EYE SHIELD CO 2300 V o r n SM . Giicage, HL PLACE "STOP LOSS" ORDERS Gua*d Agtavsi C3*tv eunch pjit rtcrJH^nb. O 'd e ' D. M. Aatcme ?u*d <w?ds- TSwgry cure you/ 'itisfei -ja^QAT r^sMV Iwb&s. unrLFsa^ OT<spp*E'2;- =*^2 &? sst>a?s<a h t g t -memsy &i*d v&r&te. D,, I? iM. AaoSSJsf fR-S^ pff&S rfewg 'nry FBfn&V o SL & <lSn ,ftea*i$^TzStsiss'ftL-"S&F*sts&uri.aSf3ai*ie* s>f9lpn-fmerrs*9. *&if fc&a-wt&SOeujawtfi*U*>* *LUs#rfl <f3iwBD'vs&m -4wasair3Mga>WJ.t 3 ig p$$s- `e mad eRtvf&f q d / p ibroogs 2*d stec* ~C??pi 2^(Asd a* arc Je**- ws sr-Cc. $ `-5C r VSJ03L S H I E B B IE S g g g a E g ^ ^ ja j to fffeciivriy om iroi thtsi require shorougfi understandiag al eecttin eoi iseering principia that ire consfjiete a iiRht al in many of Use tnstaifasit* noia in use. f o r ex&mple, where the dost c o fe a can be so irranged as to codose il suree of hist ccmplescly. or alinosi j a vrry cwnplete dust dimmaUart nu M u it. but srherr the tolet ss Sve |nr inclrrs sway from the source of the dt is rffirieney tray be iedoetd by mu. ks 90 tu 5 p er cent, so d be w holly t Recti-c.` W here Ihe eshausi equipm ent h Irris limki tl it in th e pat o< m ure u r Ic t 3 nuisance Itecausc it is itun>twitt tiv r Btwl citultl accorrlingiy be slighted will, ii Bust wvr l< reoBjiJMzcd, a< prim ari' operai ins poddem , and : tpnR siinli'y i m U- r iu n oa^stunr-- tn see th a t h fa. kept in first class com (inn a t all ume*. And so. to sunm srixe the results ifsfe brief survey of the n u d s a k s l a; trai of occupational disease ia ia ife , is Use opinion o f the writes that chic in this, direction l i d safely from stone the most serious diseases, ii One also I eludes rearrangement of Che peaces: under ^mcc&anical control," in contn with the -m edical coot ml." While agreeing that medical super rioa of n o r prospects far employment of primary importance, in order to p rent piotong new employees who ha some physical u sq u rm en t in a positi w brrr ih ry win quickly break sjewo aj mstdt of he r i haaard. ami granii the ta le e u f n srfc a l fdksa--up of ri phtyec* oltirrte] to o p w i i c j l a d s Eead and Muco), which bring alymt temporary raatfitfon that may be check by artsEca! superririon and a change arrupariao. it setans evident that in mass seriates ndosPtrial dlsssss Kszzt tht of exposure to sdir dust, chini penderne must b e placed no elim irari nr contrai of lb dtttt. in invtatiinp Sad t npxipoMfil it - sane money and grief in the long run. employ a competent engineer who ori ftaed i d ir difficulties of cnUeetiag i palpable dusts or eapum, and can hi; a reasonable assurance of gettinit hIk iiic instattaiirm riik a o l (> nwi ../ rito- -fu i anil iry~ (Hcllw'i o2^. V l 'i-toO. A%9--Pillaviw. wf !** I'M -; -5i64*eflwrf " J. ys. ftSUllt, Xl&f f. ,,njp.or 1c\Zf --if-*sf`j?m>**fJbliwle-i*VVP'miiiiiin-ii*;>-t*,? GOO 7 MfJipmeni th at will eaP`" fe A e d a i t tb ^ p iu n t w heft u (S sc w w M Tai-s b u h n Vurkcri e a t very effelsvely for -acfe equipment :r* zria,i,n* am! l.aing vklinHsUofortunately i cuiBpIctc system of *-, cotlecira^ and aepirsiiag fer a lirp e departm ent cunas a im of moneys-- more than many p la a ti fed sissy 3 pcoaibfy afford aiet procaz bastes* conditions. T c m p o t ir y ptpeil'lEiiU Kot uch casca there may fcc sh al ternatives ur tcoiptiKsry expedients that a-l a t least title matter* over ota *pruvecl bifcinrta condition* w jrranl A e installation f a permanent dort rrmm'al tyiirAl. l-iir nstam e, lisa manager o i a piaflt rrvirtssiy visited by the w rite stated that t h n had sirRnty |x m #S8jK 0 s rii- bartti cqsptuem om i ha! nt yct fuiiy the dost pnJtleiu. Io sho daius- Lry. the use of ait wtkh frac (tx-nsprayed oa the otstcra! in snfise raies iss the p ail, to improve h s handling; in lise asre&iaCTy stuf processes. offers a poerasfeg sob- tioo t the d u ll problem- Dass, ssmatS in some plants im p she utl show teilte- tirais of 9 0 per cent o r mom in raSUnM as particle* per cubic foot, and if further tests corroborate these results it offer? a simple and rum peralively iaesp eiate mrtiiod of curreeling ch rtustisaeard ie one ictetstty. * In other ogrcretciaos. w a s lbs shaking out af foundry casting*,, ft m a f be possibie to do th is werk a t sight, hi* m ea who are protected by resptate, and ti n s elim inate a gemmtm esposas to eropioyers engaged in other peta rions in che same room. The m e f ea~ (domed m e e b n ir d c a n c g u e t and nume r a l handling 5>'nrm \. properly gasa d. instead o th e oUl te t e ir te d hand methods where the worker VTSC brought s dns contact with d n y substances, offers a solution In e th e r cases. T he treasurer o f ane caaes with whom 1 retm sly dcuU A t he te a s r i of his foundry *sd. " M aybe w s hace fee asts^cr s^pr**^TM sssw f*e <L^oaglff& s?ai she design ff a maebioe which otss tab- ricatcd eoticsiy from platee. *ojiw s a d e th e r sirsetaral sfeap% riveted and welded together, ss&kh wouid entirely eliminase Use casi toy, o! which it was largely csjnpssed in the past. Where sne dusty w>fk is in ;t pem cc netit incoi'u'fl- and riv. great freedom uf ,, o*f Cp.-,,,mli ;h r air-tet respirstur may f satisfactory ro u lliFor rases c i temporary dust exposure. as ior sweeping and cleaning up lost, the unproved types of fillet respirator* n y be adequate. to some cate* ittbUioiSM may be found for tbe substance csus*K Use trouble. This has already bed* done i s loose pcesossfat. w here beasci wo* formerly ffisd, and effort are bmg made to eartead she use of this principle. The use of water so ovetcorae dttst hssanfs is one of die first suggestions that is usually made. I recently tried to explala this problem to ao radio*! manager and after cellists hint that A c dust which causes the spniisle is ieM than iflbnicrons in aiae, a micron bessg .-Jjatit 1^2S.000th a t an inch, and beiog etKXtucaeed by his mads which seemed so indirair lin t h r was inflowing m y es- {ilanst*) perfeeth'. I was a little d&n n n rfh sl at the re d tu have hips Sav, " Why can t j-sau pei rid of those microns l*y waeJiai" she air?-" ipparentlr after all m y rffnrts he still (fcnusfst a Bicm a was mnflhmg lit a microbe: W airr has bera ioaml rather effeetiv* ur laying the i t e r at susne operation# such as m teng, sweepisg ttp d u sty floors, etc. la oiher exists, it te a bees a iBappnwaiOTl as. fee tm n jils. on Onodutg wheels, where a d ry exha ust scstetn has id be mane a ih l a c - lory than wet grinding.1 rvir-te? ti e enssforerroe in Socih A irk a in }> " ooe of the spedbet poosted oat the fuiaity of trying in rcmplcUiy re cnovr dust rtau d j fay u ater sprays or ale- mttzng. adtffog th e further corameat that a tiny teplct o f water may collect i s n o n e as SOD d im partides and then ie a i^ ishaled ' fc (ike h n s t e l s f E & t as** with itrafuari ira tted o f sissfe rifle fire- ra m n a n ie il D>udenee Twe e x fa n t cniptncos U ioitaffcd. p&H- E s a te ^ a o c e aC ihse sy s s s s arhetefay iSmAs valiae s s-edsaei e r o stireiy vstrtaci a fto ssth e r too eommoo. Ae intjuiry iu a pfarat tecentiy as ca hew the diac filtertax apparato? svas rorfcsisg h tm sSs the repty, " Fiaef - u e havca'i fead r fesek a it ? r e s y e s ts i" Wlara we drahed a Uuider so the ruof ts 5eS eins SKfeSMfeSS ipBMJll. 3 tauch o a the scresm s te o k a p a iH lt ff d s a i Inm die "cleaa" suc a i tfse separat?. Anether eoaunoe and d a ^ e rr a s prac* Se so u a o y tust rtm n v ff systern ts ". > l-laa4te Bi3A{bb#IctKfasstirNTw.Vitiat I-. =V1-W. "^JJimswoto" __ frs.ffta-^Airoaon>S ,,'.>503S' * - i. . * k: .,,rft., *- -- th a t pf returning ibe filtered r ;o use plant in order ta conserve the h eat tjxat . ueaJf be ose if is were discharged o b i. fle the building. In Uve such system s whe-re doss count* hove been made d u r ing the p ast few months there ta only ede w here A e re was even, a question as fes"w hether or a c t the sir was n t to be rewress. f a cme ease over s n y s c n Blffifes d u p a rd fik s s^ r csis. f^ss were I&mi sa ESa a ir tfeat was b a n g r r r jre u lated, @r assay tim es w hat we woedd cys~ sider s, a f e lira: in e ffe c tiv e irjrtaUalW its. The rate a ra n who had put in he equiptneat had persuaded cheat chat the ffitemf ah- a t so much purer tivtn Cod i prodfect as reprraeaied by A e ouifle atmosphere that he had even piped ft mta the niffesf su the ncanager wits brrathcisg the dost a i aril 3.4 (he fan? esrapteyecto (Psfcqs. tiras might lwcalW Cauperalnl ) ttTsSe it may be gsg t>v far tt> sisy shat sa fiUering rr{turnt cao mk<- clnitjr sir suitable tar gc-faretthiag, ih r ctMSiant dsaecs o f the sesteas gettisg o at of a n t e snakes ft aimons as quesrioashle a practice as a s sttem pt ea recover d rm kia f teases- ftsms s sewape ^rssemi. iostaQatfeos that re etogged, leaatag and tserssisc itteffeetivy are cesasea. Qae of o u r ereripeere found that the iselt connecting the eahaass Isa to the motor in an overhead ssstaUasion had beets o>s for an EoeSfg pgfiod. T h e mpicw swftcb had been timnro regahufy hm '<ns noticed l&tt. there was no e th in il s i lb s gpadttsg wheels ft ssrvfesd. let sac th re sataBcwa een by A t e n te r receetly, a haadkeitnef held bc te wheel Scoff out hnriaoataffy ew&sg- l i t th e tif sras being bitwr? toward she opemtor instead' being drawn fa away k m him. An hapt& taui p a s t (bat ihoaM ht hora is m iad to defigoieg an exfiau# iyMisft is that ft is hqtbhr defkaM esp ites the dam . or capots as dose the p a te a t teds they are gmerared a proiihle, before ih ty have had a cfetcsr ta be tSffttsef throughout, (hr sir of th General ventUatiff may be helpful sedadag the csreren uatte. but it is oh viareSf of Qctle value to draw the e<> ertoas sxdsstaiKxs sjs chraueh a t e ten as ts sasaeUuaa donc, thereby carry mat them past the tte# ni the opetau'i he fw sz draw them in with ever breath. T h e design u t a pfufvr cxh-ium sy*i*- Pirase torn t* p .,-r rj