REPAIRING  A  CURTA - 2

 ``` T E C H N I C A L D A T A of the Mechanical Calculator CURTA-1 ******************************************************************* * CURTA-1 & CURTA-2 , the world's s m a l l e s t * * full-functional m e c h a n i c a l calculators ... * * * * Be sure to look at ... * * * * ===>>> www.CURTA.de , Jan Meyer's exciting Site ... * * and * * ===>>> SCIENTIFIC AMERICAN, Jan.2004, p.92-99, Cliff Stoll's * * "The Curious History of the First Pocket Calculator" * ******************************************************************* Serial Number: 504507 Dimensions: Diameter = 2_1/2 " / 65 mm Height = 4_1/4 " / 110 mm Weight: 12 oz / 350 g = CURTA-2 4_1/2 oz / 125 g = Metal Container Mechanics: System Curt Herzstark Stepped Drum / Staffelwalze Functions: Add, Subtract, Multiply, Divide Registers: Input = 11 Decimals Counter = 8 Decimals Arithmetic = 15 Decimals Manufacturer: CONTINA AG Vaduz / Liechtenstein 1960 H O W T O U S E T H E C U R T A - 2 ******************************************* See Chapter » CURTA-2 « ... R E M A R K S : =================================================================== (1) The INPUT GEARS were blocked and had to be treated 1st with alcohol to loosen and 2nd with sewing machine oil for its smooth movement. (2) OhOh! - The CURTA-2 made RANDOM CALCULATING ERRORS! After opening the top, "oxyd-dust" (???) found in the gears had to be removed. A help was »DISASSEMBLING A CURTA CALCULATOR« by Greg.A.Saville, found in the www.CURTA.de ... The missing RED MARK on the crank is home-made of insulation pipe. (3) Assembling the top parts is tricky and had to be done in sequence described in the CURTA-2 SERVICE MANUAL ... impressum: ******************************************************************* © C.HAMANN http://public.beuth-hochschule.de/~hamann 12/31/08 ```