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 241
P and Q. I found thatif there was this spark-gap in the circuit of the coil I coulddraw secondary sparks at B from the outer plate of thecondenser; and by means of a small vacuum-tube and arotating mirror I proved that these sparks were oscilla-tory in character. When these arrangements were madeI… … Fig. 117.—Professor Heinrich Hertz. THE INVISIBLE SPECTRUM 219 door-knob or other piece of metal to draw sparks. Ieven did this : I took two door-keys and tied them on toa piece of wood, so as almost to touch one another, andwith this detector I could get sparks while walking aboutto different…
Light · X-rays
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