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 202
deof a central blade of aluminium, andenclosed (Fig. 104) in a thin glassjar. To the top of the stem is affixeda disk of sheet zinc which has beenfreshly cleaned with a little sodium-amalgam. It is bent back at 450,at which incidence the results are fic. 104! most favourable. I hold near thezinc… … 182 LIGHT LECT. it is under the influence of the positive charge of theglass. The electroscope thus acquires by influence anegative electrification, and the aluminium leaves standout at a sharp angle. Now throwing a beam of ultra-violet light upon the disk, the leaves are seen to collapserapidly.…
Light · X-rays
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