KEUFFEL & ESSER, Hoboken, NewJersey / USA SN = 224842 (1930) ************************************************************************ S C A L E S of the » LOG LOG DUPLEX TRIG « Model 4080-3 ======================================================================== Front Side [ inverse / RED ] Back Side ======================================================================== L lgX [LL0] [exp(-0.001X) .. exp(-0.01X) .. exp(-0.1X)] LL1 exp(0.01X) [LL00] [exp(-0.1X) .. exp(-1X) .. exp(-10X)] DF πX A X2 ------------------------------------------------------------------------ CF πX B X2 [CIF] [1/πX] T tan(0.1X) ; [cot(0.1X)] [CI] [1/X] ST arc(0.01X) C X S sin(0.1X) ; [cos(0.1X)] ------------------------------------------------------------------------ D X D X LL3 exp(X) [DI] [1/X] LL2 exp(0.1X) K X3 R E M A R K S : ( 1° = 60' ; 1' = 60" ) ======================================================================== The TRIGONOMETRIC SCALES are devided in MINUTES(') & SECONDS(") The scales [LL0] & [LL00] are keyed to scale A. This model is made of mahogany with scales on celluloid veneer. The sturdy cardboard case is covered with black artificial leather but the lid is made of genuin leather. Historical Remarks ... impressum: ************************************************************************ © C.HAMANN http://public.BHT-Berlin.de/hamann 05/17/09 |