Elements of natural philosophy (Volume 2-3) . A striking effect is obtained by making the same figure on several plates of equal size and similar form, and then so arranging them as to make one figure on umon of several a larger scale. The figure thus produced will be both a plates of equal compound and connected one, and such as may not unfrequently be met with on a large plate. If a large square be formed out of four squares, bear-ing the figures I. and II., we shall have the following: size; Fiz. 77. Fiz. 78. The effects. 4 X I. ELEMENTS OF ACOUSTICS. 131 If the large square plates be held
Elements of natural philosophy (Volume 2-3) . A striking effect is obtained by making the same figure on several plates of equal size and similar form, and then so arranging them as to make one figure on umon of several a larger scale. The figure thus produced will be both a plates of equal compound and connected one, and such as may not unfrequently be met with on a large plate. If a large square be formed out of four squares, bear-ing the figures I. and II., we shall have the following: size; Fiz. 77. Fiz. 78. The effects. 4 X I. ELEMENTS OF ACOUSTICS. 131 If the large square plates be held at a, touched at a, Particular case;and a bow be drawn across at &/similar compound fig-ures will be generated. Cymbals, the Chinese Tam-tam or Gong, &c, are prac- Examples;tical applications of sonorous plates. § 121. The vibrating motions of sonorous bells resem- sonorous beiis;ble those of circular plates. In this case, too, themost acute pitch is accompanied by the most complexfigure. To render these vibrations visible, fill a bell-shapedglass lather more than half full of water; draw a vio-lin bow across the rim, and at the same time touch theglass at two opposite points of the rim with the surface of the water will acquire an undulatorv mo-Means of makingtion, and to make the sonorous fiVu res permanent, strew lhee acoustlc o *? figures visible; the surface of the wrater with any light and exceedinglyfine powder, as semen lycojyodii. If the point excitedby the bow be at a distance of 45° from t
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