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 23
there. However, all this is introductory to the subject ofshadows in general. If we dont take special precau-tions, or use very minute objects to cast shadows, weshall not observe any of these curious effects. Theordinary shadows cast by a bright light proceedingfrom any luminous point are… … Fig. i. travelling of ripples by use of a shallow tank of water, 1 Ripple-tanks for illustrating the propagation of waves have longbeen known. Small tanks were used at various times by ProfessorTyndall. See also Professor Poynting, F.R.S., in Nature, 29thMay 1884, p. 119. I LIGHTS AND SHADOWS 7 on…
Light · X-rays
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