Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 137
ot vibrate: hence all nodalFig. 152. lines pass through that point. Or the same effects may be produced cheaply by using common windowpanes, as follows: A pane of glass is supported by its middlepoint upon a small block of soft rubber. A long glass tube is thenfastened to its upper surface by wax… … 460. So long as the plate gives the same tone, the sys-tem of nodal lines remains constant. But by touchingany point in the edge with the finger, that point is made anode, a new sound is produced, and a new system of nodallines developed. 461. By clampingthe plate at other pointsthan the centre,…
Physics
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