atively hard blow (not push) with upward of a hundred impacts may occur before they come to rest. the finger. nicely illustrated by collision balls. As bought in the a It is essential that they shall be hung so as to be stores, this piece of apparatus is quite expensive. In POLARIZED… … glass, or, better, a piece of plate mirror. A simple support, 12 or 16 inches high, made of three The tube shown in detail partly in section in Fig. 3 pieces of wood is provided. Its construction is shown is provided with an inner tube of pasteboard or wood, in the cut. On this the spheres are…
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