. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. * Lead wool, impregnated with glycerine. Occasional mechanical failures resulting from the useof the dry lead gasket were overcome by the use of thesecomposition gaskets. Stokes Tozic Smoke Shell. This problem v;as one of mechanicaldesign to assist the Pyrotechnic Sectioh. to develop the standard Stokes shell for use with diphenylchlorarsine. The prob-lem, as outlined by the Pyrotechnic Section was to secure agas-tight capsule, that could be placed in the shell prefera-bly in f
![. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. * Lead wool, impregnated with glycerine. Occasional mechanical failures resulting from the useof the dry lead gasket were overcome by the use of thesecomposition gaskets. Stokes Tozic Smoke Shell. This problem v;as one of mechanicaldesign to assist the Pyrotechnic Sectioh. to develop the standard Stokes shell for use with diphenylchlorarsine. The prob-lem, as outlined by the Pyrotechnic Section was to secure agas-tight capsule, that could be placed in the shell prefera-bly in f Stock Photo](https://c8.alamy.com/comp/2AG1JAJ/chemical-development-section-and-mechanical-research-and-development-section-summary-of-achievements-1917-1918-lead-wool-impregnated-with-glycerine-occasional-mechanical-failures-resulting-from-the-useof-the-dry-lead-gasket-were-overcome-by-the-use-of-thesecomposition-gaskets-stokes-tozic-smoke-shell-this-problem-vas-one-of-mechanicaldesign-to-assist-the-pyrotechnic-sectioh-to-develop-the-standard-stokes-shell-for-use-with-diphenylchlorarsine-the-prob-lem-as-outlined-by-the-pyrotechnic-section-was-to-secure-agas-tight-capsule-that-could-be-placed-in-the-shell-prefera-bly-in-f-2AG1JAJ.jpg)
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. Chemical development Section [and] Mechanical Research and Development Section; summary of achievements, 1917-1918. * Lead wool, impregnated with glycerine. Occasional mechanical failures resulting from the useof the dry lead gasket were overcome by the use of thesecomposition gaskets. Stokes Tozic Smoke Shell. This problem v;as one of mechanicaldesign to assist the Pyrotechnic Sectioh. to develop the standard Stokes shell for use with diphenylchlorarsine. The prob-lem, as outlined by the Pyrotechnic Section was to secure agas-tight capsule, that could be placed in the shell prefera-bly in filled condition. Openings for discharge would be pro-vided at several places closed by fusible plugs, A smokemixture similar to that used in the toxic smoke candleswould be employed to first melt out the fusible plugs andthen vaporize the diphenylchlorarsine. It was importantthat the diphenylchlorarsine should not become excessivelyheated so that it would take fire. Two designs were workedout, differing generally in that in one case the toxic ma-terial was discharged at the same end as the smoke and in the -112-. other eas6 at the opposite ^ii^l of the shell, 3oth thesetji^es of Shell were under construct ion at the time experi-mental work was sh«it do-jm at tfe^ University and fieither wasput in sufficiently finished condition to try dut.Special Jfivens Shell fdr Arsiae- A reijuest was received forwork on this problem by the Pyrotechnic Section, who desireda special shell of the Livens type that would be suitable tocontain arsine. The pressure requirements called for a shellof about twice tiie bursting strength ofthe standard. Con-ference with the Ordnance Department developed that thekilwaukee Pressure Steel Company was the most available con-cern to attempt the manufacture of this shell. A design wasmade up and a man dispatched to handle the matter with theabove concern. They suggested various modifications in thedesign which would adapt it for their manufacturing facili-ti