KEUFFEL & ESSER, New York / USA SN = 070386 (1930) *********************************************************** S C A L E S of the K & E »FAVORITE« Model 4056 =========================================================== Front Side Back Side =========================================================== A X2 ----------------------------------------------------------- B X2 S sin(0.01X); sin(0.1X) L lgX C X T tan(0.1X) ----------------------------------------------------------- D X R E M A R K S : ( 1° = 60' ; 1' = 60" ) =========================================================== The TRIGONOMETRIC SCALES are in MINUTES(') & SECONDS(") S keyed to A/B ; T keyed to C/D The slide rule is made of mahogany with scales on celluloid veneer. On the back are conversion tables and constants - given as fractions. It came in a black cardboard case with the fading inscription » K & E FAVORITE SLIDE RULE 4056 « Historical Remarks ... impressum: *********************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 08/12/09 |