FREDERICK POST CO., Chicago, Illinois / USA (1959) ************************************************************** made by HEMMI / Japan SCALES of the P O S T Bamboo-Based P O C K E T Model 1444K ============================================================== 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. The slide rule came in a red-brown leather 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 05/21/08 |