RT Journal Article SR Electronic T1 A new photographic spectroscope JF American Journal of Science JO Am J Sci FD American Journal of Science SP 58 OP 59 DO 10.2475/ajs.s3-34.199.58 VO s3-34 IS 199 A1 C. C. Hutchins YR 1887 UL http://www.ajsonline.org/content/s3-34/199/58.abstract AB