FREDERICK POST CO., Chicago, Illinois / USA (1968) *********************************************************** made by HEMMI / Japan S C A L E S of the P O S T Bamboo-Based Model 1447 =========================================================== Front Side [ inverse / RED ] Back Side =========================================================== A X2 ----------------------------------------------------------- B X2 S sin(0.01X); sin(0.1X) [CI] [1/X] L lgX C X T tan(0.1X) ----------------------------------------------------------- D X K X3 R E M A R K S : ( 1° = 60' ; 1' = 60" ) =========================================================== The TRIGONOMETRIC SCALES are divided in MINUTES & SECONDS S keyed to A/B ; T keyed to C/D The bamboo sides are held together with a metal sheet. On the back are US/Metric CONVERSIONS & TRIGON.RELATIONS. The slide rule came in a grey hard-cover case. HEMMI introduced a year code, starts with 1950 = "A" ... and the month code starts with Jan. = "A" ... This slide rule has the code "SI", means it is made in September 1968. Historical Remarks to POST ... Historical Remarks to HEMMI ... impressum: *********************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 02/23/07 |