for tlic cspircd air is fitted. Siicii iiinsks cnniiot Iic iisrcl ivlicrc tlicrc is :iny toxic g i s prcsciit irit,Ii t,lic rhist or ivlirrc tlicrc is II tlrficiciicy of osygcii.
'l'lic iicrtl for n coiiifortnlilc niid clliciciit cliist ninsk is 1)ccoiiiiJig iiiorc iIJlfl iiioris ii1q):iriwt iii ortlrr to ~tiiiiil) out tlic tlisciiscs of silicosis pr~diicctl liy tlic iiiliiiliitioii of silira dust, for csniiiplc, in qiinrryiiig arid ~iiiitl~toiic cutt,iiig :uid tlrrssiiig, iiiitl of iislirstosis, protliicccl in tlic ~vorkiiig of iisl)cstos. Wet workiiig alid vciitilntioii Iiiivc tloiic iiiucli to rcdiicc tlic iliirigws, I)iit tliorc :ire iiiiiiiy ciiscs wlicrc t.licst: i~irt~liods will iiot siiflicc iiiicl wlicrc soiiic iiic:iiis to Imveiit, or :it Iriist to rcdiicc, tlic iiiliiilirtiori of cliist is ~iccc*ssriry. In :i few ciiscs :I liosc iiiiisk riiii I)c iiscd, Init. it lins olivioiis Iitiiitiitioiis, :iiitl II (lust iiiiisk o r rcspiriitor to Iirotcct tlic riosc iiiid iiioiitli is reqiiircd. I , I Iic critcriii of iiii clliciciit, dust, rc.spir:itor :ire : ( u ) I I igli liltwing cllic~iriicy iigiiiiist ill1 sizcs of piirt i c h s of tlict cliist ivitlioirt iiricluc intcrfcr~iicc with tlic I)rriitliiiig of t.lic* wciircr, iiiid witlioiit rrqiiiriiig coristiiiit8 rcpliicciiieiit.. ( b ) 'f'lic rrspir:itor ~i i i i s t . fit t 111: \vcrircr in iiii xirtight iiiiiiiii~~r so t h i i t iill iiir h i i t lied liiisses t.liroiigli tlic filter. Nore tliiui oiic size iiiiiy Iiiive to Ijc 1iroviilrtl. ( r ) 'l'lic ros1)iriitor iiiiist. iiot interfere with tlic wciirer's visioii to siicli i111 cstciit t.liiit tiis work is Iiiiitlorcil or rciitlrrctl tliiiigcroiis.
((7) ~i c rcspirntor niust I ~C c o m f d r t a ~c in iisc,: cspccinlly ~-1 i ~i i
worn, :is it Iins to l)c, for.long pcriodsi ~o ticsip 011 tilc ~iiiirkct ciiii I E rcgnrcM as. siitisfiictory in tlic liglit of tlic iil)ovc tl&lcratii, :iiicl work is now h i n g co~itliictctl Iiy ii C:ovcrriiiiciit 1)cpiirt.iiiciit iii i i i i iitteiiipt to solve tlic pro1)lciii.
CONCLUSION
This 1)ric.f description of tlic Iirotcct,ivc nppliiiiiccs avtiiliiliic for rleiilirig with tlic giis arid tliist Iinziirds in iiitliistry will, it is lioprd, hc of soiiic n ~~i ~t i i i i c ~ in iiitiiciitiiig tlio type to I,(! cliosrii for :illy 1)iirticlilar set of coliclit ions iiiitl tlir iiit.tliocls to 1, c iitloptcd to cnsiiri! t,liiit tlic iipp~iiiiici-s :ire iii n fit stiitc to wenr wlicii iiii ciiiergeiicy iiriscs.
I~i~iaIly, it, ciiiiiiot I,c too stroiigly iirged t l i i i t tlic siifcst coiirsc is to go witti tlic piirti(*iiliir protective prohl~iii to ii firiii \i-Iiicli Iiiis sIicciiilizc!tl in t lie tlosigii
iiiid protliict ioii of tlicsc cleviccs, :is t l i i i t is really tlic oiily wiiy of eiisiiriiig tliiit tlic protective iippliiiiiccs ;ire iii every iviiy siitisfiictory for tlic piir110sc for ~vliicli they :ire iritctitlcil.
C:rritcfiil iicIaio\vIctIgiiiciit is iiiiitie to tlic firlli of Ilcssrs. Siclie Goriiiiiii t !