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 . 84 Experiments xrith [Biok V — the parlicle-s of the fluid then Itoino; hnrri(>J along with a velocity toogreat to allow any of them to change their direction to escape at the &»!lowliig abstract of experiments made hy us in 1834-5, to ilJiis-trate the same principle, may interest some readers :—To ascertain theextent to which atmospheric pressu
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 . 84 Experiments xrith [Biok V — the parlicle-s of the fluid then Itoino; hnrri(>J along with a velocity toogreat to allow any of them to change their direction to escape at the &»!lowliig abstract of experiments made hy us in 1834-5, to ilJiis-trate the same principle, may interest some readers :—To ascertain theextent to which atmospheric pressure was removed from under the sheetof paper, we bent a small glass tube at right angles, and placing one endunder the paper let it rest on tlie table, while rhe other descended into atumbler containins; a little water. Then taking a small pair of bellows,and directing tlie blast over the pipe, the water rose from one half to threefourths of an inch. The books upon which the sheet laid were then placedwithin two inches of each other, when tne effect was increased, the liquidrisincr from Ih to 2 inches. We next laid aside the paper and made useof two tubes, one to blow through and the other to measure the ascent ofthe No. 203. No. 204. No. 206. No. 207. No. 208. No. 209. Two leaden or block tin tubes, straight and polished in the , utireunited at right angles. See No. 203. A G the blowing pipe, S incheslong and lialf-inch bore. B 12 inches Ions and three-eighths bore. Theupper end of B was joined flush and smooth with the interior of the otherthree inches from the end A. Upon applying the mouth to C and blowingin the direction C A, indicated by the arrow, instead of the liquid risingin B, part of the current from the lungs entered that tuJ>e and was forcedthrough the water in the tumbler. Various portions of the end A werethen cut off without changing the result, until half an inch only remainedin front of the joint, when the air no longer descended, but n
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
