THE Chladni plates in use at the present time for producing nodal lines are ordinarily made of brass, ten inches square (or ten inches in diameter if circular) and one eighth or one sixteenth of ...
64.2 x 51.8 cm. (25.3 x 20.4 in.) ...
23 plates : engraving, b&w ; 32.5 x 21 cm. or smaller.
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