Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 669
ch are pivtjted two pendu-lums. The rear pendulum is prolonged above its pivot, andis provided with a right-angled arm projecting toward thelantern, parallel with the back board. The upper end ofthe rear pendulum is provided with two or three inter-changeable weights, varying from two to six… … Compound Pendulum. pound weight. To the rod of the front pendulum is pivotedan offset bar, provided at one end with annular frame con-taining a transparent glass disk and having at the opposite LANTERN PROJECTION. 647 end an adjustable counterbalance weight. The glass disk isprovided with a small…
Physics · Lantern projection · Electric apparatus and appliances
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