ACU-RULE MFG. CO., Mt.Olive. Illinois / USA (1965) *************************************************************** SCALES of the ACU-MATH P O C K E T MANNHEIM Model 1200 =============================================================== Front Side Back Side =============================================================== K X3 A X2 --------------------------------------------------------------- B X2 S sin(0.01X); sin(0.1X) CI 1/X C X T tan(0.1X) --------------------------------------------------------------- D X L lgX 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 QUESTION: ********* The 3 CURSOR HAIRLINES do not match "Area/Diameter" Relations as usual. When the center hairline is set on ( C-Scale ) 2, the left hairline is on 1.72 and NOT ON sqrt( π ) = 1.77 =???= ====== The SR came in a worn brown leather case. Historical Remarks ... impressum: *************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 01/01/10 |