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 274
e inthe farther part of the tube. A drying-tube, filled with method of connecting the pump with the object to be exhausted, bymeans of a thin, flexible, spiral glass tube ; the method of cleansingthe fall-tube by letting in a little strong sulphuric acid through astoppered valve in the head of the… … 252 LIGHT • LECT. phosphoric acid to absorb moisture, is interposed betweenthe pump and the vacuum-tube that is to be exhausted.It is usual to add a barometric gauge to show the degreeof vacuum that has been reached. Before you, fixed against the wall, is a mercury-pumpsubstantially like Fig. 132,…
Light · X-rays
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