. Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy . .••a^^Hv If I ki^Bsi^mi Pig. 84.—Cathode rays. The upper row are concave cathodes; the lower rows are fiat. Viewingfrom left to right, is shown the progressive increase in the production of the cathode rays as thepressure is gradually decreased. (Bouchard.)

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectradiolo, bookyear1910