Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 457
various times for overcoming this difficulty, but perhapsthe best and most convenient is the so-called Wehnelt cathode, METHODS OF ILLUMINATION 437 as described by Wiedemann and Wehnelt.^ Tliese author?pointed out that if a piece of platinum foil covered with cal-cium, strontium, or barium oxide,… … FiG. 159. cumstances, the anode melts and volatilises, and the vapourfrom it is brilliantly illuminated by the discharge.* This is a most convenient method of examining metallicspectra. Konen and Jungjohann^ have devised a specialform of vacuum tube for this particular purpose of direct-cur-rent…
Spectrum analysis
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