ally one part of the figure BY GEO. M. HOPKINS. rotating with the top. In this case each perforation] will appear to turn in one direction while another A scientific top and a few experiments adapted to it | of the disk forms a circle, and the circles formed by! part turnsin the opposite direction.… … chord. A large number of experiments with plication of more or less friction to the disk, a this simple siren are described in Prof. A. M. ee ree great variety of intricate and beautiful figures Mayer’s interesting little book on sound. Sav- are produced. Examples are shown in Figs. 9, art’s wheel…
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