The improved glass-grinding machinery of Johann Georg Leutmann, from his Neue Anmerckungen vom Glas-Schleiffen (Wittenberg, 1719), Plate III.

by daniela
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    The form for the lens was fixed, and rotated, inside the box at the left of Figure 1, which was driven by hand by the large pulley wheel at the right. The plan of the machine in Figure 2 shows a variety of pulleys on the shaft at the left which offered various speeds of rotation.

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    Illustration 15

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