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)
of the vibrationswill be as 1 to 3. This verifies the third law. If the cords are of different densities, but every other way alike andequally stretched, it Avill ^la 20 be found that the fourthlaw is verified in each case. Figure 20.—Inter-ference of sound il-lustrated by t-wo vi-brating cords. —…
Physics · Astronomy
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