is to press down the thumb piece, as shown in our engraving.By this means, the upper ends of the bars are forced apart,and the motion of the gymnast regulated according to theqaantit j of pressure applied. The inventor also adds hooked … extremity of the apparatus, shown in Fig. 2, is a simple ar-rangement for holding an ordinary pencil. The mode ofusing the device for striking circles is obvious from our en-graving. In making ellipses, the third point is attached tothe end of the center piece. When not used as a tram, thepoints…
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