Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
d, uponthe end of which, within the receiver,is a bell. The rod is bent at rightangles above, to form a handle, T,with which to ring the bell. The sound of the bell can be dis-tinctly heard when the receiver isfilled with air. If the air be ex-hausted, the bell cannot be heard.By exhausting the air… … Vibrations of Rods and Plates. 576. Vibrations of rods.—Rods, like cords, vibrate. If theyare fixed firmly by one of their extremities, as in a vice, they will, Avhenset in motion, be divided by stationary undulations into several vibrat- ACOUSTICS. 317 ing parts. The nodal points may be…
Physics · Astronomy
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