PT - JOURNAL ARTICLE AU - Michelson, A. A. AU - Morley, E. W. TI - On a method of making the wavelength of sodium light the actual and practical standard of length AID - 10.2475/ajs.s3-34.204.427 DP - 1887 Dec 01 TA - American Journal of Science PG - 427--430 VI - s3-34 IP - 204 4099 - http://www.ajsonline.org/content/s3-34/204/427.short 4100 - http://www.ajsonline.org/content/s3-34/204/427.full SO - Am J Sci1887 Dec 01; s3-34