Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 283
rranged like the analj-zer. In Fig. 274 is shown the tourmaline tongs, the simplestpolariscope known. It consists of two plates of tourmaline,cut parallel to the optic axis of the crystal, and mounted incells arranged to turn in eyes formed at the extremities ofthe looped wire. When the plates are… … Tourmaline Tongs. POLARIZED LIGHT. 261
Physics · Lantern projection · Electric apparatus and appliances
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