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 . ingers Mechauick Powers, Lon. 1696. p. 72. 76 Horizontal Tread WhecL [Book L to his plate, and thence to his mouth. Hence the advice of Ovid, forneither Greeks nor Romans used table-forks : Your meat genteelly with your fingers raise ; And—as in eating theres a certain grace, Beware, with greasy hands, lest you besmear your face. A German writer in the midd
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 . ingers Mechauick Powers, Lon. 1696. p. 72. 76 Horizontal Tread WhecL [Book L to his plate, and thence to his mouth. Hence the advice of Ovid, forneither Greeks nor Romans used table-forks : Your meat genteelly with your fingers raise ; And—as in eating theres a certain grace, Beware, with greasy hands, lest you besmear your face. A German writer in the middle of the 10th century, in sugiresting thewhirling Eolipile as a turnspit, remarks, it eats nothing, andgives withalan assurance to those partaking of the fuast, whose suspicious naturesnurse queasy appetites, that the haunch has not been pawed by the turn-spit, in the absence of the housewifes eyes, for the pleasure of lickinghis unclean fingers. This evil propensity of human turnspits, however,eventually led to their dismissal, and to the employment of another spe-cies, which, if not better disposed to resist the same temptations, hadless opportunities afforded of falling into them. These were the caninelaborers already No. 25. Horizontal Tread-Wheel, from Agricola. Horizontal tread-wheels f)r raising water are described by Agricola,from whose work, De lie Metallica, we have copied the figure. Twomen on opposite sides of a horizontal bar, against which they lean,push with their feet the bars of the wheel on which they tread, behindthem. Similar wheels, inclined to the horizon were also used. For an-other kind of tread-wheel, see chapters 14, and IT. On the Noria andChain-pump. In all the preceding machines the roller is used in a horizontal position ;but at some unknown period of past ages, another modification was de-vised, one, by which the power could be applied at any distance fromthe centre. Instead of placing the roller as before, over the wells mouth,it was
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