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FOWLER  VEST-POCKET  CALCULATOR

 ```FOWLER's Long-Scale Vest-Pocket Calculator SN = 11726 ***************************************************************** FOWLER & Co., Manchester / England w.Metal-Case ( 1900 ) Diameter = 2 11/16 " (68 mm); Thickness = 7/16" (11 mm) The KNOB WITH RING turns the m o v a b l e FRONT SCALE The OTHER KNOB turns (1st) the POINTER on FRONT SCALE (2nd) m o v a b l e BACK SCALE FIXED INDEXES are under the "RING" KNOB on BOTH SCALES Front Scales: ================================================================= (a) An outer "Short" (7 1/2 ") Circular Scale 1 ... 10 (b) Six inner Circles form a "Long" (30") Scale 1 ... 10 Back Scales: ================================================================= (a) Outer "Short" (7 1/2 ") Circular Scale 1 ... 10 (b) 1/X 10 ... 1 (c) lg(X) 0.01 ... 1 (d) sqrt(X) 0 ... 100 (e) sin(0.1X) 5°45' ... 90° (f) tan(0.1X) 5°45' ... 45° (g) sin(0.01X) 35' ... 5°45' S H O R T INSTRUCTION for Calculations on F R O N T SCALES ================================================================= LIST OF ABBREVIATIONS: M = Middle knob turns front scales R = Knop ON THE RIGHT turns C = Cursor on front H = Hairlines are fixed ----------------------------------------------------------------- MULTIPLICATION 2*3*4 = 24 Set X=2 under H with M Set C on X=1 with R Set X=3 under C with M ( Read X=6 under H ) Set C on X=1 with R Set X=4 under C with M RESULT: Read X=24 under H ==== DIVISION 6/3 = 2 Set X=6 under H with M Set C over X=3 with R Set X=1 under C with M RESULT: Read X=2 under H === R E M A R K S T O R E S T O R A T I O N ... ================================================================= One GLASS WAS CRACKED. The decision was made to replace both glasses with PVC from a CD-Case. Hairlines are made with an »X-ACTO« and colored with a marker in RED ==>> The advantage: FIXED POINTERS are RED, the MOVABLE POINTER is (orig.) BLACK. impressum: ***************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 02/24/10 ```