Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 151
this case the steel bar forms a part of thecircuit. The magnet is provided with a Hght woodenspring-pressed arm, carr3ang a contact point and a con-ductor. This arm is arranged to follow the bar up and downthrough the upper half of its excursion, breaking the contactat the median position of the… … Vibration by Magnetic Impulse. long. A much larger bar might be used. Without doubt,even an iron girder of great size and weight might be set inactive vibration by the same means. SIMPLE SOUND RECORDER. In Fig. 134 is shown a simple device for recordingsounds autographically.* The propelling of the…
Physics · Lantern projection · Electric apparatus and appliances
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