Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 460
on thestrength of the current. As the deflection for a very lightcurrent is small, a beam of light reflected from the concavemirror is employed as an index. The scale is arranged asshown in Fig. 427, the light being projected from a lamp, DYNAMIC ELECTRICITY. 437 supported at the proper height… … 13CO regularly, are arranged on the marks on opposite sides of o.The common paper scale used by draughtsmen answers forthis purpose. When the coil is at rest, the light spot remains at the 438 EXPERIMENTAL SCIENCE. center of the scale, but when a current passes through thecoil, the beam moves…
Physics · Lantern projection · Electric apparatus and appliances
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