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 . ofthe windlass, which may here be noticed, and for which wc are indebtedto the Chinese. It furnishes the means of increasing mechanical energyto almost any extent, and as it is used by them to raise water from someof those prodigiously deep wells already noticed, (p. 30,) a figure of it,(No. 19,) is Llsertcd. The roller consists of two parts of unequal di-a
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 . ofthe windlass, which may here be noticed, and for which wc are indebtedto the Chinese. It furnishes the means of increasing mechanical energyto almost any extent, and as it is used by them to raise water from someof those prodigiously deep wells already noticed, (p. 30,) a figure of it,(No. 19,) is Llsertcd. The roller consists of two parts of unequal di-ameters, to the extremities of which, the ends of the rope are fastened onopposite sides, so as to wind round both parts in different directions. Asthe load to be raised is suspended to a pulley, (See fig.) every turn of theroller raises a portion of the rope equal to the circumference of the thickerpart, bul .Tt, the same lime lets down a portion equal to that of the smaller;consequently the weight is raised at each turn, through a space equal onlyto half the liiilerence between the circumferences of the two parts of thoroller. The action of this tnachine is therefore slow, but the )advantages are proportionably great.**. No. 19. Chineaa Wimllasc!. No. 20. Fusee Wlndlags. This is the neatest and most simple modification of the wheel and a.\lo,that human ingenuity has devised, and is .a proof that the principles ofmechanical science were well understood in remote ages ; for every me- • De Re Metallica, 1657. p. 118, 119, 160. Architecture Hycliaulique, toin. 2, p. 333. • BeNfoii;-. Tlieatre des In.^tnmicus Matlieniiitiques et Mecbat«(^u<;s. A Lvi, ;» The Chinese, by J. F. Davis, vol. ii, 2S6. 70 TLe Fusee. [ 1, chaiiiciiXJi, we think will aJinit. ih^it mechanical tact and ingenuity, unaidcJby sci(!ntilic knowledge, euiild never have devised it. It exhibits a specieso?originality so unicjue, so simple and efficient, that evidently shows it
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Keywords: ., bookcentury1800, bookdecade1870, bookiddescriptiveh, bookyear1876
