Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 673
h the design is drawn is attached bydrawing tacks to the lower part of the baseboard. Therock shaft, <■/, is provided with a long key, c, which extendsdownward, and is pressed outwardly by a spring underneath 6?o EXPERIMENTAL SCIENXE. it. The key is prolonged above the rock shaft, where it… … Lantern Pantograph, long, and the longer arms are 12 inches long. That is to say,when the bars are at right angles to each other, the distancebetween the bars, b b, is 4 inches, the distance between thebars, c c, is 12 inches, the distance from the tracing needleat the center of the transparent…
Physics · Lantern projection · Electric apparatus and appliances
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