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 244
ferent experimenters to produce electric waves.Some of these are shown in Fig. 120. The first is oneof those used by Hertz himself. Instead of flat wings ofmetal he used in this case cylindrical metal conductors.In another form, described as a dumb-bell oscillator,there were two large metal balls.… … Fig. 120. Righi for making short waves. Here there are threegaps, the central one being between two balls immersedin an oil vessel to prevent premature discharges. Thelowest form in Fig. 120 is also of Professor Righis devis-ing. It represents his apparatus for producing exceed-ingly short…
Light · X-rays
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