. 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. ible: but now, alfo, as before, at the veryfirft turning of the ftop-cock, to let the air out of the receiver, the cupping-glafs fell 36. We took the bfafs-ring, formerly mentioned, and coverd it with aS2/wS- ^^^ bladder, which was fo tyd on, that the bottom of the bladder coverMeat heat. the Upper orifice of the ring, and lay ftretcliM upon it, whilft the neck of the bladder was ty
. 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. ible: but now, alfo, as before, at the veryfirft turning of the ftop-cock, to let the air out of the receiver, the cupping-glafs fell 36. We took the bfafs-ring, formerly mentioned, and coverd it with aS2/wS- ^^^ bladder, which was fo tyd on, that the bottom of the bladder coverMeat heat. the Upper orifice of the ring, and lay ftretcliM upon it, whilft the neck of the bladder was tyd with a ftring, near the middle of the lower orificeTig. 5s. of the ring ; and, in this lower part of the bladder, we made two or three fmall holes, for the air to pafs in and out at: then, having placed, at thebottom of our cappd receiver, a thick piece of wood, perforated to re-ceive the neck of the bladder ; we placed the coverd ring upon this pieceof wood, fo that the upper part of the bladder lay parallel to the horizon;then we fufpended, at the key belonging to the cap of our receiver, ablind glafs-head, inftead of a cupping-glafs, which name it may bear; and V^OLii. Plati:.ML Im 61. Phyflco-mechanical Experiments. 505 and to the upper part of this glafs, we faflend a large ring of metal to f^^^iJ^^Vprefs it againft the bladder. The receiver being now cemented on to the Tlf engine, we, by the help of the key, let down the cupping-glafs till it almofttouchd the level fuperhcies of the bladder; and when the receiver was mo-derately exhaufted, we let down the cupping-glafs a little lower, fo that itrefted upon the bladder, and touchd it with all the parts of its orifice ; , . whence the cupping-glafs with its fubjacent bladder was become an inter-nal receiver wherein the air was confiderably expanded. Then we warilylet the air into the receiver, and thereby the air that furrounded the cup-ping-glafs or internal receiver, having now a ftronger preflure than that inthe cuppin
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