. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. o make fadlitious air, we muft put the matter which is to pro-duce the air, into the receiver FF i and placing that on the plate AA,by means of the fcrew, we ftrongly faften it thereto, as in our enginefor comprefling the air; the ftop-cock BB, we infert into the female-fcrew D: then the orifice C, and with it the receiver, is to be placed up-on the pneumatic-engine, and the ftop-cock B, being opend,
. The philosophical works of the Honourable Robert Boyle esq.: abridged, methodized, and disposed under the general heads of physics, statics, pneumatics, natural history, chymistry, and medicine. o make fadlitious air, we muft put the matter which is to pro-duce the air, into the receiver FF i and placing that on the plate AA,by means of the fcrew, we ftrongly faften it thereto, as in our enginefor comprefling the air; the ftop-cock BB, we infert into the female-fcrew D: then the orifice C, and with it the receiver, is to be placed up-on the pneumatic-engine, and the ftop-cock B, being opend, the air is tobe extraded. When the receiver FF, is emptied of air, the ftop-cock B, isto be fhut, that all pafiage to external air into the receiver may be de-nied i and the ftop-cock, being taken out from the female-fcrew D, thereceiver is prefently to be immers^d in water ; fo that, at leaft the plateA A, with the ftop-cock, may be coverd therewith : thus no air fromwithoiit can find entrance j and the air, produced out of the matter in thereceiver, will be preferv*d unmixd j whilft the degrees of its rarifaction,QX compreffion^ are known, as thofe of common air. Bur ^j75-l %r5^. ^^^^ Plate xvi.
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