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absorbed absorption accompanied with excess acetylene air added air for puriﬁcation air leak beaker blue gas bromine fumes burette burned caloriﬁc value candle-power capillary tube carbon dioxide carbon monoxide cent checkerwork chemical close cock coal gas combination combustion Composition by weight conﬁned constituents contraction due Cubic feet air cubic foot deﬁcit Density or speciﬁc distilled water drain Ethylene explosion feet air necessary feet per lb ﬁgures ﬁll ﬁre ﬁrst ﬂame ﬂow FORMULA funnel gas analysis ground joint hydrocarbons hydrochloric acid hydrogen impurities industrial gases leveling bottle lower stop-cock methane mixed mixture nitrogen Non-combustible Gross open cock outﬁt oxygen Pintsch gas potassium hydrate solution potassium hydroxide presence produced puriﬁed pyrogallic acid reagent rubber tubing slowly Solubility spark speciﬁc gravity steam storage bulb sume one cubic t. u. per cubic Turn cock underloaded wash water water gas water level