C-THRU® RULER COMPANY, Hartford, CT / USA (1970) ***************************************************************** S C A L E S of the P O C K E T - R I E T Z Model » 27 « ================================================================= Front Side [ inverse / RED ] Back Side ================================================================= < 0 ... 6" 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 < 0 ... 15 cm Ruler > 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 "Plastic-Sheet" Pocket-SlideRule came in a plastic bag with an INSTRUCTION SHEET. The SR is not precise, but useful, because under the slider ( in the body ) are CONVERSION-Tables and on the back side of the slider is a DECIMAL-EQUIVALENT-Table. When the slider is pulled out, it can be used as an INCH / METRIC - RULER. Historical Remarks ... impressum: ***************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 06/13/13 |