FREDERICK POST CO., Chicago, Illinois / USA (1969) ********************************************************** made by HEMMI / Japan SCALES of the POST MINI-POCKET Bamboo-Based Model 1441 ========================================================== Front Side [ inverse / RED ] Back Side ========================================================== ( 0 ... 4" Ruler ) A X2 ---------------------------------------------------------- B X2 S sin(0.01X); sin(0.1X) [CI] [1/X] L lgX C X T tan(0.1X) ---------------------------------------------------------- D X 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 This MINI was NOT A TOY! It came in a nice leather case. The bamboo sides are held together with a metal sheet. HEMMI introduced a year code, starts with 1950 = "A" ... and the month code starts with Jan. = "A" ... This slide rule has the code "TF", means it is made in June 1969. Historical Remarks to POST ... Historical Remarks to HEMMI ... impressum: ********************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 06/23/07 |