According to Lewes, the maximum amount of ammonia found in the acetylene
coming from a dripping generator is 0.95 gramme per litre, while in
carbide-to-water gas it is 0.16 gramme: 417 and 70.2 grains per cubic
foot respectively. Rossel and Landriset have found 4 milligrammes (1.756
grains [Footnote: Milligrammes per litre; grains per cubic foot. It is
convenient to remember that since 1 cubic foot of water weighs 62.321 x
16 - 997.14 avoirdupois ounces, grammes per litre are approximately equal
to oz. per cubic foot; and grammes per cubic metre to oz. per 1000 cubic
feet.]) to be the maximum in water-to-carbide gas, and none to occur in
carbide-to-water acetylene. Rossel and Landriset return the minimum
proportion of sulphur, calculated as H_2S, found in the gaseous state in
acetylene when the carbide has not been completely flooded with water at
1.18 milligrammes per litre, or 0.52 grain per cubic foot; and the
corresponding maxima at 1.9 milligrammes, or 0.84 grain. In carbide-to-
water gas, the similar maxima are 0.23 milligramme or 0.1 grain. As
already stated, the highest proportion of phosphine yet found in
acetylene is 2.3 per cent. (Lewes), which is equal to 32.
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