. 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. little longer than the cylinder ; one edge of it be-ing fmooth, and the other indented, to receive the teeth of a fmall iron-nut «t 5>, fixed by two ftaples to the underfide of the board nailed a-crofs22, on which the cylinder ftands; and it is turn*d by the handle 7. The laft part of the pump is the valve R, a hole at the top of the cy-linder, and taper towards the cavity; to this is fitted a bra
. 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. little longer than the cylinder ; one edge of it be-ing fmooth, and the other indented, to receive the teeth of a fmall iron-nut «t 5>, fixed by two ftaples to the underfide of the board nailed a-crofs22, on which the cylinder ftands; and it is turn*d by the handle 7. The laft part of the pump is the valve R, a hole at the top of the cy-linder, and taper towards the cavity; to this is fitted a brafs-plug, to betaken out as occafion requires. The engine being thus contrived, fome oilmuft be pourd in at the top of the receiver upon the ftop- cock, to fill upthe interftices of its parts, and that the key S, may turn with the greatercafe. A quantity of oil, alio, muft be left in the cylinder, to prevent theair from getting betwixt that and the fucker; for the like reafons, fomemuft, hkewife, be apply M to the valve. And here tis proper to cbferve, that when we ufed oil, or water, fe-parately, for this purpofe, and they have not anfwered the end, a mixture of TOLL PIATETIE a^ Z- ^o^- I. MA TIC S. Phyftco-mechamcal Experiments. 400 of the two has afterwards proved eftedlual. And, that the air may notP^E^^enter betwixt the brafs-cover and the ring, twill be convenient to lay ^ ^fome diachylon-plaifter on their edges with a hot iron. That no air, alio,may remain in the upper part of the cylinder, the handle is to be turndtill the fucker rifes to the top ; and then, the valve being fhut, it is to bedrawn down to the bottom; by which means, the air being driven out ofthe cylinder, and a fucceflion from without prevented, the cavity of thecylinder muft be empty of air; fo that, when the ftop-cock is turnd toafford a communication betwixt the receiver and the cylinder, part of theair before lodged in the receiver, will be drawn down into the cylinder ;which, by turning back the ke
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