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RUSSIAN  SLIDERULE  WATCH

 ```Diameter = 2 " ( 50 mm ) Thickness = 1/2" ( 13 mm ) B O X = 2 3/8" * 2 6/8" * 1 1/8" 60 mm * 70 mm * 28 mm ```
 ```MOSCOW Research Institut for Control Equipment Model »KL-1« *************************************************************** DEPARTMENT of Equipment for Automation & Control / USSR (1966) The KNOB with the BLACK DOT t u r n s the FRONT SCALE The KNOB with the RED DOT turns the POINTERS ON BOTH SCALES A FIXED INDEX is under the "BLACK DOT" KNOB ON FRONT SCALE Front Scales: T U R N A B L E =============================================================== (a) X2 Outer Scale 1 ... 10 ... 100 (b) X Inner Scale 1 ... 10 Back Scales: =============================================================== (c) X Outer Scale 1 ... 10 (d) sin(0.1X) 5°45' ... 90° (e) tan(0.01X .. 0.1X) Spiral 1° ... 45° R E M A R K S : ( 1° = 60' ; 1' = 60" ) *************************************************************** The TRIGONOM. SCALES are divided in MINUTES(') & SECONDS(") SCALE (c) is R E C I P R O C A L refering to (b) SCALE: 1/X (c) <===> (b) X This clever design allows ... I N S T R U C T I O N S for » Short-Cut « - Calculations: =============================================================== LIST OF ABBREVIATIONS: BM = Black Mark on front BK = Black Knob turns front scales RK = Red Knob turns on both sides the RP = Red Pointer(s) --------------------------------------------------------------- (1) MULTIPLICATION 2*3 = 6 Set RP over X=2 on Scale(c) with RK With BK set X=3 on Scale(b) under RP RESULT: Read X=6 on Scale(b) under BM === (2) DIVISION 6/3 = 2 Set X=6 of Scale(b) under BM with BK Set RP over X=3 on Scale(b) with RK RESULT: Read X=2 under RP on opposite Scale(c) === (3) DIAMETER => CIRC-AREA Set MARK "C" on Scale (b) under BM Set DIAMETER with RP on Scale (b) Set MARK "1" of Scale (a) under BM RESULT: Read AREA under RP on Scale (a) ( Example: DIAMETER = 2 ==> AREA = π ) impressum: *************************************************************** © C.HAMANN http://public.beuth-hochschule.de/~hamann 03/28/10 ```