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absorption coefficients acteristic radiation applied voltage B. A. Wooten Batesville Bergen Davis BN/b C. S. Brainin calcite calculated characteristic radiation Chromium 24 cm thick coefficient of absorption COLUMBIA UNIVERSITY constant Coolidge cathode Copper 29 copper and chromium corrected crystal decreases dependence of energy developed by Bergen electron electroscope elements of lower EMORY CARL UNNEWEHR ENERGY OF CHARACTERISTIC energy of emission equation fixed spheres fluorescent re-emission given in Table higher atomic number Intensity of characteristic ionization chamber K-characteristic emission K-radiation from Cr line radiation lower atomic number metal were obtained methyl iodide mica in metal mica window movable spheres natural leak obtained by B. A. obtained by Richtmyer order of spectra particular wave-length PHOENIX PHYSICAL LABORATORY Phys radiation curve radiations as emitted rate of discharge reflection Rhodium 45 rotated Silver 47 spark gap spectra of shorter spectrometer target theory values voltage squared voltmeter Whiddington x-ray tube