RT Journal Article SR Electronic T1 On hitherto unrecognized wavelengths JF American Journal of Science JO Am J Sci FD American Journal of Science SP 83 OP 106 DO 10.2475/ajs.s3-32.188.83 VO s3-32 IS 188 A1 S. P. Langley YR 1886 UL http://www.ajsonline.org/content/s3-32/188/83.abstract AB