Sound : an elementary text-book for schools and colleges (1913)
Capstick, John Walton, 1858- · leaf 201
TES AND BELLS [CH. XI In the case we are considering 1 and 4 move together,and 2 and 3 move together, but in the opposite direction to 1 and 4. If then 1 and 4 are at any moment movingupwards and sending out a condensation, 2 and 3 must bemoving downwards and sending out a rarefaction. The… … The next higher note that can be produced gives the figureNo. 1 of Fig. 90. Hold the plate at a corner and bow at thecentre of one side to produce this figure. Nos. 2 and 3 aretwo other patterns that are easily produced. In each casebow at the centre of a side, and hold the plate at the pointa…
Sound
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