RT Journal Article SR Electronic T1 On the distribution of the dark lines in the spectra of the elements JF American Journal of Science JO Am J Sci FD American Journal of Science SP 31 OP 40 DO 10.2475/ajs.s2-38.112.31 VO s2-38 IS 112 A1 Gustavus Hinrichs YR 1864 UL http://www.ajsonline.org/content/s2-38/112/31.abstract AB