Society of Glass Technology · [Sheffield] · leaf 515
separateretorts in each set are connected bybends, D, having covers, E, and withsampling attachments, T, each com-prising tubes, Y1, Z4, and a plunger,T2, which is lowered when requiredand given half a turn to direct thesample of material into the tube, F4.The material is charged and dis-charged… … 39. Vapour Electric Lamps. H. George, Paris (Brit. Pat.,March 28th, 1919, No. 7841. Convention date, August 8th,1918).—A mercury-vapour lamp contains an inert gas, such asnitrogen, argon, or, preferably, neon, at a pressure of the order FUELS, REFRACTORIES, AND FURNACES. 33 of atmospheric. In a…
Glass
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