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 . quantity equal to the space previously occupiedby the air within it and the pipe. To convert this simple apparatus into a pump, twovalves or clacks only are wanting. ()ne, opening up-wards and placed in any part of the pipe or at eitherof its extremities. This will allow water to pass upthrough it, but none to descend. The other placedover an aperture made
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 . quantity equal to the space previously occupiedby the air within it and the pipe. To convert this simple apparatus into a pump, twovalves or clacks only are wanting. ()ne, opening up-wards and placed in any part of the pipe or at eitherof its extremities. This will allow water to pass upthrough it, but none to descend. The other placedover an aperture made on the top of the bag, andopening outwards—through the contents of thevessel when collapsed can be discharged; and whenaistended it \vill close, and thereby prevent the en-trance of the external air. The instrument thus ar-ans^ed becomes a belloios pump, (No. 81,) a machine,which from the obvious application of the bellows toraise and spout water as weil as air, has been re-invented by in almost every 81. Bellows Iump. The figure scarcely requires illustration. It repre sents a pipe attached to the under board of a circularO lantern bellows, the orifice of which is covered by a claijk—the uppei No. Chap 6.] Old German Bellows Pump. 2Q) board has also an opening in Its CfMitre which is closed 1 } a valve or ciack,ana also furnished with a rod and handle. The under board sometimesforms the- bottom of a box, in one side of which a spoul is inserted, aschown by the dotted lines. The earliest representation of a bellows pump which we have metwith in books, is among the curious cuts attached to the first Germantrinslation of Vegetius, from which No. 82 is copied. (Erffurt 1511) Itwill sulKce to show the application of tliis kind of pump to raise waterat tliat time. There was of course a valve covering the fnterior orificeof the nozzle and opening outwards, to prevent the air from enteringwhen the upper board was raised. This valve is not shown becau
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
