. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. section comprised the develop-ment of a suitable cylinder for the gas, atop valve to closethe cylinder during charging and after discharge, and to pro-tect the opening val/e, and the opening valve itself that wasused when the tank was fired. A suitable nozzle was alsodeveloped to decrease the noise of discharge. Recommendationof this section was for a light tanls. about 8 in diameter,16 long, and this was adopted and specifications drawn upby the Ordnance Department. The work d
. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. section comprised the develop-ment of a suitable cylinder for the gas, atop valve to closethe cylinder during charging and after discharge, and to pro-tect the opening val/e, and the opening valve itself that wasused when the tank was fired. A suitable nozzle was alsodeveloped to decrease the noise of discharge. Recommendationof this section was for a light tanls. about 8 in diameter,16 long, and this was adopted and specifications drawn upby the Ordnance Department. The work done on the stop valvewas in the form of cooperation with members of a valve com-mittee from the Pyrotachnic Section and the Ordnance A satisfactory valve, of the semi-needle type withforged bronze body and .Monel metal stem was finally valve was put in .Tjroduction by the Ordnance special type of si;op valve with a hollow stem was developedby this department and recoim; endcxtions were secured for from the Ordnance Departinent. A number of opening -105-. TYPE MO. 2 FABRIC S^OZZLjH - UQiQEZDNUB. CA3T IROW OP^UWG VALVE -FUSE DIRING DWIO^. valves were developed, the final one being in the form ofthe Crown Cork and beai Company bottle cap, using a leadgasket backed up by cork. This seemed to promise favorablyat first, but later developed defects that caused its rejec-tion. The wprk on the discharge nozzle resulted in the r»ro-duction of one using a diaphragm of snecial cotton fabricwhich gave good atomization of the TJhosgene-chlorine mixtureused Xn the toxic gas cylinders and a high rate of dischargewith small size and, weight, its single defect was the possi-bility of cQx^rosion by the toxic gases. Impregnation experi-ments were started to overcome this objection, but were notcompleted at the time of cessation of work at the tes-ts showed the nozzle to be satisfactory re-garding corrosion during
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