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)
Figure 27 represents another nodalfigure of a circular plate. Many h undred forms of nodal figures havebeen determined. Triangular and polyg-onal plates all give symmetrical figures,analogous to those obtained with squareplates, as represented by the following twoillustrations. ACOUSTICS. 319… … Figure 29 represents nodal figures of a triangular plate. Fig. 20. moo Refraction of Sound. 581. Figure 30.—Refraction of sound.—Althongli soundis reflected by any surface of different density from that in which it Fig. ?>0.
Physics · Astronomy
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