The electron, its isolation and measurement and the determination of some of its properties

by Robert Andrews Millikan

[145] Phil. Mag., XXVI (1912), 1024; XXVII (1914), 703.

[146] Jahrbuch der Radioaktivität u. Elektronik, XIII (1916), 326.

[147] Comptes rendus, CLXV (1916), 87, 352.

[148] Barkla and Sadler, Phil. Mag., XVII (May, 1909), 749.

[149] Soddy, The Chemistry of the Radioelements, Part II, 1914.

[150] Millikan and Bowen, “Extreme Ultra-Violet Spectra,” Phys. Rev., January, 1924.

[151] Balmer (1885) expressed the formula in wave-lengths. Ritz (1908) first replaced wave-lengths by wave-numbers, or frequencies, and thereby saw his “combination-principle,” while Rydberg discovered the general significance of what is now known as the Rydberg constant

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[152] Paschen, Ann. d. Phys., XXVII (1908), 565.