KEUFFEL & ESSER, New York / USA (1961) ************************************************************ S C A L E S of the » K & E K - 12 Prep « Model 4158 ============================================================ ( one-sided only ) K X3 A X2 ------------------------------------------------------------ B X2 S sin(0.1X); sin(0.01X) CI 1/X T tan(0.1X) C X ------------------------------------------------------------ D X L lgX R E M A R K S : ( 1° = 60' ; 1' = 60" ) ============================================================ The TRIGONOMETRIC SCALES are in MINUTES(') & SECONDS(") S keyed to B ; T keyed to C The SR-Body is made of white/green/white plastic layers. It came in a green soft plastic case with the booklet » Learning to Use the Slide Rule - Step-By-Step, Easy ... « Historical Remarks ... impressum: ************************************************************ © C.HAMANN http://public.BHT-Berlin.de/hamann 12/14/08 |