UNIVERSITY STUDIES 
Vou. VIII «JANUARY, 1908 No. 1 
I.—On the Magnetic Separation of the Lines of Barium, Yttrium, 
Zirconium, and Osmium 
BY B. E. MOORE 
I. INTRODUCTION 
The investigations of Balmer,’ followed by Rydberg*® and by 
Kaiser and Runge, showed that many of the spectral lines ot 
different substances formed series which could be expressed in a 
simple empirical equation. Preston,* in the study of the Zeemann 
effect, observed that similar series in different substances had 
identical magnetic separation of the lines, when these separations 
"were measured in wave-frequencies instead of wave-lengths. Pres- 
ton’s data were very meager, and his law was first thoroughly 
established by Runge and Paschen.* Inversely, then, lines of like 
magnetic separation are members of a series, according to Pres- 
1Wied. Ann. 25, p. 80, 1885. 
*Phil. Mag. (5), 29, p. 331, 1890. Zett. Ph. Chem. 5, p. 227, 1890. C. R. 
Chem. 110, p. 394, 1890. Kgl. Svenska Vet Akad. Handl. 32, Nr. 11, 1890. 
Astrophys. Jour. 6, pp. 239, 338, 1897. ‘ 
“Runge. Report Brit. Assoc. 1888, pp. 576-77. Kaiser and Runge. 
Wied. Ann. 41, p. 302, 1890; 43, p. 384, 1891; 48, p. 126, 1893; 52, p. 93, 
1894. Berl. Ber., pp. 639, 759, 1895. Astrophys. Jour. 3, p. 4, 1896. Wied. 
Ann. 61, p. 641, 1897. Astrophys. Jour. 8, p. 70, 1898. 
“Phil, Mag. (5), 46, p. 325, 1898. Proc. Royal Dub. Soc. VI, p. 385, 
1898. Proc. Royal Dub. Soc. VU, part II, 5. 2. 
° Sitsungsber. de Berl. Akad. am. 6 Feb. 1902. Sitsungsber. de Berl. 
Akad. am. XIX, pp. 389, 720, 1902. Siteungsber. de Berl. Akad. am. X, 
p. 417, 1904. Astrophys. Jour. XV, pp. 235, 333; XVI, p. 123. 
UNIVERSITY StTub1Es, Vol. VIII, No.1, January 1908. 
