KEUFFEL & ESSER, New York / USA SN = 190340 (1927) ************************************************************ S C A L E S of the » K & E POLYPHASE « Model N4053-5 ============================================================ Front Side [ inverse / RED ] Back Side ============================================================ ( 0 ... 20" Ruler ) ------------------------------------------------------------ A X2 ------------------------------------------------------------ B X2 S sin(0.1X); sin(0.01X) [CI] [1/X] L lgX C X T tan(0.1X) ------------------------------------------------------------ D X K X3 ------------------------------------------------------------ ( 0 ... 50 cm Ruler ) 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 This slide rule is made of mahogany with scales on celluloid veneer. Its back side has conversion tables and constants - given as fractions ( same as Model N4053-3 ). Screws on the back side allow adjustment of the sliding friction. It came with a brown leather case in a box and with 2 CURSORS. Historical Remarks ... impressum: ************************************************************ © C.HAMANN http://public.BHT-Berlin.de/hamann 12/13/08 |