CONCISE, Tokyo / Japan (1970) ******************************************************************** S C A L E S of the CIRCULAR SLIDE RULE » CONCISE Model 260 « ==================================================================== Front Side [ inverse / RED ] Back Side ==================================================================== D X outer circle D X -------------------------------------------------------------------- C X inner circles S sin(0.1X) [CI] [1/X] T tan(0.1X) A X2 ST arc(0.01X) K X3 L lgX R E M A R K S : ( 1° = 60' ; 1' = 60" ) ==================================================================== The TRIGONOMETRIC SCALES are divided in MINUTES(') & SECONDS(") The INNER CIRCLE of the TRIG-SCALE is turnable, but the readings are VALIDE ONLY, when the "90" on "S" is set to "1" on "D". Because both "D"-Scales are clockwise, there is no transfer to "A"-Scale on the opposite side to SQUARE Trig-Functions. It has to be made in two steps on the Trig-Side... EXAMPLE: [ sin(8°) ]2 ==>> 0.0194 This Circular SR came in a black soft-plastic case. The CURSOR was broken and is now home-made ... See Chapter "FAQs" Historical Remarks ... impressum: ******************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 12/22/12 |