RT Journal Article SR Electronic T1 The color correction of certain achromatic object glasses JF American Journal of Science JO Am J Sci FD American Journal of Science SP 454 OP 456 DO 10.2475/ajs.s3-19.114.454 VO s3-19 IS 114 A1 Young, C. A. YR 1880 UL http://www.ajsonline.org/content/s3-19/114/454.abstract AB