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TORPEDO
 ``` T E C H N I C A L D A T A of the Mechanical Calculator TORPEDO ********************************************************************** This German calculator is a small and light-weight "HALF-COMPTOMETER" Serial Number: 010380 Dimensions: (ca.) Width = 8_1/4" / 21 cm Depth = 6 " / 15 cm Height = 4_1/4" / 11 cm Weight: (ca.) 4_3/4 lbs / 2.2 kg Mechanics: 9*5 "HALF"-Keyboard, COMPTOMETER-Coding = Instant Additions Functions: Addition, Subtraction (as 9-Complement Addition) Registers: Input = 8 Decimals Arithmetic = 9 Decimals Manufacturer: TORPEDO WERKE Frankfurt a.M. / Germany 1930 H O W T O U S E the TORPEDO *********************************** To CLEAR the REGISTER push the right LEVER down and release it. As mentioned to the "Key-Driven-Calculators" BURROUGHS & COMPTOMETER: Calculator courses suggested to use only the lower-half of the full keyboard to speed-up additions in saving hand/arm motions: instead key 6 press 3 + 3 in sequence 7 3 + 4 8 4 + 4 9 4 + 5 Obviously the method was used, because the lower-half of the keyboard show more wear on most calculators of this type. Consequently TORPEDO made a "HALF-COMPTOMETER": Smaller, mechanically less sophisticated, more light-weight and therefore much cheaper than the "big" ones. Because for "SUBTRACTION" 9-Complement "Addition" has to be used, the leftmost key has to be a "9" ( on the BURROUGHS this key is empty ). Logically TORPEDO placed two keys instead: "5" + "4" ... Because there are no 9-Complements on the keys, do it in this way ... A Subtraction Example: 765 - 432 = 333 ---------------------- o Enter on the right columns "765" o Calculate the SUBTRAHENT MINUS 1 432 - 1 = 431 o Calculate the 9-COMPLEMENTS of "431" = 568 o Hit on the right columns 5 3+3 4+4 o INSTEAD "Press all 9-Keys left of the subtrahend simultaniously": - PRESS all "5"-Keys left of the subtrahend simultaniously and than - PRESS all "4"-Keys left of the subtrahend simultaniously For more information: Have a look at the BURROUGHS site Have a look at "Calculating Trickies" ... impressum: ********************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 05/16/07 ```