Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 305
Diapbragm and Fine Adjustment. To the instrument as received from the manufacturer isapplied a home-made diaphragm, as shown at A, in Fig.294, and a fine adjustment, as shown at B C, in the same fig- FiG 295. … Substitute for Revolving Table. ure. The diaphragm consists of a piece of perforated thinsheet metal, extending along the under surface of the stage,and neatly bent over the outer edge of the stage, so as to be MICROSCOPY. 283 self-supporting—the perforations of the metal being respect-ively…
Physics · Lantern projection · Electric apparatus and appliances
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