Mechanick powers; or, The mystery of nature and art unvail'd ... Together, with a treatise of circular motion artificially fitted to mechanick use, and the making of clock-work, and other engines ... The whole comprized in ten books, and illustrated with copper cuts / By Ven. Mandey, Philomat [and J. Moxon].

Venterus Mandey

Date:: 1702

Credit: Mechanick powers; or, The mystery of nature and art unvail'd ... Together, with a treatise of circular motion artificially fitted to mechanick use, and the making of clock-work, and other engines ... The whole comprized in ten books, and illustrated with copper cuts / By Ven. Mandey, Philomat [and J. Moxon]. Source: Wellcome Collection.

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of the power is double from the Hypomoclion, and while the weight G afcends to H, the Power F will be moved to a double dillance : It is not needful here to /hew all rhe Combi¬ nations of Pulleys, but only in this cafe to fhew the double force of the power, and that force which before was equal to i oo pound weight, by this diipofition may be made equal to 200 pound weight. Of the Wedge. Fig. 6. |' THE Wedge is an Inftrument made of follid matter, as Iron os Wood ending in a /harp point or edge, As A B C D E F, fome Authors drive to reduce it to the Leaver, in which we are indifferent, and the Wedge feems to be a double Leaver of the fecond kind, in which the Hypomoclicn is in the line G H, the weight in Rand K, the Power in L and M, but how ill they have refented or reduced it, we will fhew hereafter; However it be, it is certain the force of the Power is increafed by the fharpnefs of the Wedge, and the accutenefs of the Angle, becaufe while the bodies which have the force of the weight, go back from one another by the line R K, the Wedge is moved accord¬ ing to the line I O : Add alfo, that the power which is ftruck with a blow on the head of the Wedge, makes a greater motion, than the Power which is made by weight lying on the head of the Wedge, Of the Screw. Fig. 7. THe Screw is a mod powerful Machine, or Engin, and is a Cylinder cut with a wreathed circle about it, which may be varioully conftituted and made : We dial] not attempt to reduce it to the Leaver, but fis certain, that one man v/ho can alone by his own ftrength raife ioo pound, may by this Engin fometimes raife 10.000 pound. For let the weight be be D E, the Power C, in the mean while that the weight is, moved according to the dillance which is between two wreaths, or fpires of the Saeiv, it is necefiary that the power placed in the point C abfolves or fnidies a whole Circle 5 therefore let the dillance between the two wreaths be equal to the line N Q> then, feck how many times the line N Q is..,

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