PT - JOURNAL ARTICLE AU - T. C. Mendenhall TI - On the use of planes and knife-edges in pendulums for gravity measurements AID - 10.2475/ajs.s3-45.266.144 DP - 1893 Feb 01 TA - American Journal of Science PG - 144--150 VI - s3-45 IP - 266 4099 - http://www.ajsonline.org/content/s3-45/266/144.short 4100 - http://www.ajsonline.org/content/s3-45/266/144.full SO - Am J Sci1893 Feb 01; s3-45