Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 257
uished and will reappear inalternation. All vibrations, except those executed parallelwith the axis of the tourmaline, are quenched. A Nicolprism (to be described later on) will do the same thing.When the Nicol is turned, the black spots seen bj thetwo rays become alternately visible and invisible.… … Course of Li^ht through Iceland Spar. reproduces the extinguished spot and effaces the visibleone. This experiment shows that the vibrations of thetwo rays are in planes at right angles to each other. Abeam of light in which all of the transverse vibrations areparallel with a single plane is…
Physics · Lantern projection · Electric apparatus and appliances
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