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 250
duction-coil and battery. The detector Dconsists of a number ofsmall metal springslightly pressing againstone another, traversedby a current from asingle cell C in thecircuit of which is in-cluded the galvanometer G. The detector D is set up on amovable arm on an optical circle, so that the optical… … Fig. 126.
Light · X-rays
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