. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. made which showed entire protection forsixty minutes onnan tests against detonated diphenylchlor-arsine with resistance of about 30 tiim. of water at the stand-ard rate of 85 l/m. .It is safe to say that little more ex-perimental work would be necessary to make filters of thistype reproducible and capable of being manufactured in largequantities. Molded Pulp Plat Plate Filters. Parallel to the developmentof the doughnut filters from these molded pulps, another form of filter us
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. made which showed entire protection forsixty minutes onnan tests against detonated diphenylchlor-arsine with resistance of about 30 tiim. of water at the stand-ard rate of 85 l/m. .It is safe to say that little more ex-perimental work would be necessary to make filters of thistype reproducible and capable of being manufactured in largequantities. Molded Pulp Plat Plate Filters. Parallel to the developmentof the doughnut filters from these molded pulps, another form of filter using the same material was studied. This consistedof a flat plate of the filter material of suitable thickness(l/2 to s/4). and of length and width corresponding toheight and width of the canister. It was proposed to sealthe edges o^fthis plate to the edges of the side-flow development, though incomplete, gives indicationsof a possible form fpr a good filter Canister, Going back now to the period of January to April 1916, a m^nor investigation was made of the posstbilitiee -79-. MOLDED PULP BLOCK MD-D0l7SHNgT FILTER of developing a canister to be worn on the head. A numberof shapes were made, including cylindrical cans, oval cans,and. cans of curved section, all intended to be worn at theback of the head and siq)ported by a hood attached to the of these: contained any smoke protection. The oossibili-ties of this head-carried type ofcanister did not appear tohave much valu:? from the army standpoint, and as an army in-vestigation was dropped. The work was carried along as anaval problem and resulted in the navy head canister^ asreported elsewhere. Artillery Canister. Another investigation of this earlyperiod of 1918 was the attempt to develop a low resistancecanister without smoke protection, but with a life againstwar gases approximately equal to that of the standard canister(Type G). It was thought that such a canister would be ofva
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