Tyndall, John, 1820-1893 · New York : Appleton · leaf 133
bvious if we vary our last experiments. Before youis a piece of India-rubber tubing, 10 or 12 feet long,stretched from c to «, Fig. 39, and made fast to two pinsat c and a. The tube is blackened, and behind it is 126 SOUND. placed a surface of white paper, to render its motionsmore visible.… … (1) (2) (3) (4) (5) (G) the upper half also is thrown into vibration. Withdraw-ing the hands wholly from the tube, its two halves a band b c continue to vibrate, being separated from eachother by a node b at the centre (2). I now encircle the tube at a point b (3) one-third of THE NODES NOT POINTS…
Sound
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