A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . as made inthe centre of A, through which a smooth pistonrod ]?, played; two pistons or boards, P P, accu-rately fitted to work in the trunk, were attachedon opposite sides of the partition to B ; these pis-tons v/ere perforated, and the openings covered byflaps or valves like those of a common pump box,but the upper one was secured to the umler sideof the p
A descriptive and historical account of hydraulic and other machines for raising water, ancient and modern : with observations on various subjects connected with the mechanic arts: including the progressive development of the steam engine . as made inthe centre of A, through which a smooth pistonrod ]?, played; two pistons or boards, P P, accu-rately fitted to work in the trunk, were attachedon opposite sides of the partition to B ; these pis-tons v/ere perforated, and the openings covered byflaps or valves like those of a common pump box,but the upper one was secured to the umler sideof the piston as shown in the figure. The trunkrested on four short pieces of wood pegged to some, holes were made at the lower part forthe admission of air. These bellows were there-fore double acting, and consequently one of themwas etjual in its effects to two of those representedat No. Ill, which drive the air out only on the de-scent of the piston, whfreal these forced it into thefire both on ascending descending. Thus,when the blower raised the rod B, the flap on tiiclower piston closed, and the air in that division o( <= Bells Travels, i. 312. ^ De Re Metallica, pp 162, 163, 164, 169. • GarcilassobCommentaries, p. 347. No. 114. Ooiihle Acting Bel-lows ol j^IailaLiiscar. Chap. 2.] On the Bellows among the Pcrurinns. 2j3 trunk was expelled through C ; at the same time the flap of the upperjiistou was opened by its own weight and the air passing through it, andon the descent of B all the air in the upper part o( the trunk was forcedinto the fire in like manner; hence an uninterrupted, though not an e<juableblast of wind was kept up. The whole apparatus was of wood exceptthe flaps, which were pieces of green hide rendered pliable by in the hands ; and they were prevented from opening too far bynarrow slips of the same material pegged over them. There was nopacking to he pistons, Init they were moved with great rapidity. These beJiows are differ
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
