Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 393
furnishedat the opposite end with a pair of collars between which isclamped a vulcanite disk. In a socket at the base of thestandard is inserted a forked bar of wood which extends 370 EXPERIMENTAL SCIENCE. upwardly and embraces the vulcanite disk, each arm of thefork being provided on its inner… … to which are attached metallic rings arranged on oppositesides of the vulcanite disk, and provided with a number ofshort points projecting inwardly. To the forked woodenbar is attached one edge of a segmental silk case, whichincloses a portion of the disk between the cushions and thecollector.…
Physics · Lantern projection · Electric apparatus and appliances
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