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 269
e state of knowledge and theslow means of communication—over the mercurialphosphorus, as it was last year over the Rontgen rays.This mercurial phosphorus was simply a little glasstube, such as that (Fig. 130) which I hold in my hand.It contains a few drops of quicksilver; and the air thatotherwise… … Fig. 130 glass walls sets up electric discharges, which flash throughthe residual air, illuminating it at every motion. While I have been talking to you an air-pump in thebasement, driven by a gas-engine, has been at workexhausting a large oval-shaped glass tube. Only per-haps thj-q part of the air…
Light · X-rays
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