Show Y val amy y mask has JL J L as new ew features feature ir fa n S it po os isible ible for officers to YS t S give orders in battle Q without removal ach cle ch ashington inn the chemical has devel war of talo wee vet ala mask 0 so 0 constructed d a lie IV v gas to c carry arav on eeb ecna tile the wearer enable e and thus sn ivall while hll using it IV n can ca to t 0 for 0 li sa possible r ing it removing it ps without battle tile to in en of vital imbor will viii be ch a mask Is ard and tho the in operations tn in troop ion of speaking bespeaking be device ln in this BUM 0 type of billark la is regarded by greatest improvement n as the pera the close of the gas as aks since regard it us ns tile tho irid ad wil afar r they device of its kind ott nearly y perfect the world wearer can talk majk has ft sort of dla dia M brial the row liral attachment son somewhat similar P that used on 44 bufis pha indans of 0 lt it the wearer of B mask can carry on conversation iler aler ath tb about 60 per cent of tho the B of the average speaking voice T edcah experts had been trying to ij leve the same mime result through a lic phona but with the de llop meat ment of the diaphragm ideal idea tile the tempt empt to arrange the mask so os as to vide for telephone conversation lias has sea abandoned tho the diaphragm at emment Is less cumbersome not corna coma and experiments conducted conduct el by 0 anny have demonstrated that the man voice la is reproduced efficiently UY my brough rough use of the new attachment athe the perfection of the new mask has kj ba cha the te point acro where orders havo have en given even tor for its production on a n con lerable erable scale at the edgewood gewood Bd ornal arnal the new mask embodies a aber her of other recent developments conti contains lins a new canister which ugh the addition of new chemicals t only protects the wearer wearer against ie e ordinary gases used in chemical adore but also against arn ammonia morda mes and the deadly carbon f ie e it Is expected that this lm im IroT ement will make the tha new mask valuable to firemen in great cities ff vr ellas to mine workers arkers and those ho 0 are employed in the fumigation vessels ves sela other new features noe are also features embraced i the construction ot of the new alli so canister that lessen air re tance stance and reduce the distress of breathing to practically a negligible quantity tills this improvement included elimination of tile the nose und and mouzli pieces and has resulted in considerable reduction in tile mount of char coal used in III tile the mask tile the new nev lunsk likewise contains a for passing dry air froni from the chemicals over the eyeglasses of the mask this pro vents collection of moisture and considerably sider ably improves tile vision A special arrangement also enables tile the chemical containing case to be carried under the arm instead of on tho eliest chest ns as in III other types of masks and thus provides greater free freedom doul in body movement of the experiments are also being con conducted luct with chemicals that render cloth I 1 pervious impervious in to burning gases but which will at the saini time ehno permit moisture from the human body to es eg cape |