Light visible and invisible : a series of lectures delivered at the Royal Institution of Great Britain, at Christmas, 1896 (1897)
Thompson, Silvanus Phillips, 1851-1916, Royal Institution of Great Britain · New York : Macmillan · leaf 137
the vibrations,the motions of the cord are confined by means of a pairof glass plates mounted in wooden cylinders (Figs. ;_\73). At the first nodal point of the cord the first pairof glass plates acts as a polariser, P; the cord beyondthat point vibrating in the plane thus imposed upon it.A pointer… … pair of glass plates is set at the second nodal pointto act as an analyser, A. The vibrations of the cord in POLARISATION OF LIGHT 117 arc made vertical by the polariser P, and when theplane of the analyser A is also vertical (as in Fig. 72)the vibrations which pass through the polariser…
Light · X-rays
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