side the base. Both triangles are formed of boards which are divided and hinged insuch a way that by simply swinging certain parts on their hinges the tri-angles become rectangles, twelve inches long and three inches high. Whenthe triangles and the sectors which form the circle are ordered at the… … Fig. 1. Fig. 2. Fig. 3. These three pieces demonstrate the relation between the contents of acone, sphere and cylinder. Fig. 1 is a conical cup, three inches in diame-ter at the top, and three inches deep. Fig. 2 is a solid sphere. Fig. ;>is a cylindrical cup, three inches in diameter and three…
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