. 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. f gardens, and grottos. Hence we infer, that, had we not wanted convenient veffels, we might,by the preffure of the air, included in the bottle, have raifed water four-teen times as high as we did quick-filver in the former experiment • fince,upon weakening the preflure ot the air, but a little, in the double receiver,that within the bottle was able to impel the water, forcibly, and for aconfiderable
. 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. f gardens, and grottos. Hence we infer, that, had we not wanted convenient veffels, we might,by the preffure of the air, included in the bottle, have raifed water four-teen times as high as we did quick-filver in the former experiment • fince,upon weakening the preflure ot the air, but a little, in the double receiver,that within the bottle was able to impel the water, forcibly, and for aconfiderable time, to the top of a pipe a yard long, and higher. Hence, too, it appears, that, in thofe hydraulo-pneumatical engines,where water is placed between two parcels of air, the water may beput in motion, as Vv-ell by the mere dilatation of one of the parcels,as by giving a new force by heat, or compreffion, to the other. And,whether this mechanical principle of motion may not prove ufeful in en-gines, we leave to be confiderd. But if, when fome of the air had been pumped out of the receiver, weremoved that double veffel from the bottle, the external air would, by its weight. Phj/lco-mechanical Experiments. 479 weight, fuddenly deprefs the water in the pipe, till, having driven it to ^^^i^^^^ct. the very bottom, it afcended in numerous bubbles thro* the water, and ^--^^f^^ joined it feif with the air incumbent on that liquor. Twas here obfer- vable, that all the external air, which got into the bottle, did not come in fuddenly; but, after the firft irruption, we could perceive, from time to time, new portions of air, leifurely infinuate themfelves thro the pipe into the bottle, and emerge thro the ftagnant water in bubbles, that fucceeded one another very flowly ,• as if the fpring of the included air, having been once deprived of its natural conttitution, by its late expanfion, could be but gradually reduced to it, by the weight of the atmofphere, which was ft
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