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)
The space between the nodal lines is just double the distance betweenthe nodal lines and the edges of tlie plate. The signs plus and minusrepresent opposite phases of vibration. Fig. 26. … 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…
Physics · Astronomy
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