Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 155
in Fig. 137. In a baseboard is inserted a wire, one-eigrhth inch or more in diameter and about a foot long. On 132 EXPERIMENTAL SCIENCE. this wire is placed an ordinary spool, and above the spool athin apertured board (shown in the detailed view), the boardbeing about 8 inches long and 6 inches… … •Oa^^^^A^^^^^^^-^ - Rotating Mirror. a crank bv which to turn the board. Upon opposite sidesof the board are placed mirrors of a size corresponding tothat of the board, the mirrors being secured to the boardby strips of paper or cloth pasted around the edges. Theimage of the flame is viewed in the…
Physics · Lantern projection · Electric apparatus and appliances
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