A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 704
e shown by hanging up an electricbell, inside an air-tight bell-jar,and gradually pumping the air out(Fig. 624). As the amount of airin the jar becomes smaller, thesound of the bell gets feebler.Complete silence is never attained,because the bell must be sup-ported in some way, and wavespass to… … air pump FIG. 624. -Experiment to show that soundis transmitted by air. All material substances, however, can transmit sound waves ; ifa faint tapping or scratching be made at one end of a long table,the sound can be heard on putting the ear to the other end of thetable, even when the noise is too…
Physics
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