SUMMIRA-7
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T E C H N I C A L D A T A of the Mechanical Calculator SUMMIRA-7 ******************************************************************** Serial Number: 31865 Dimensions: (ca.) Width = 5 " / 13 cm Depth = 7_1/2" / 19 cm Height = 5 " / 13 cm Weight: (ca.) 4_3/4 lbs / 2.2 kg Mechanics: Setable Counter with Input Check Functions: Add, Subtract Registers: Input = 7 Decimals Arithmetic = 7 Decimals Manufacturer: Paul G. Mueller Roisdorf bei Bonn West Germany 1950 H O W T O U S E the SUMMIRA-7 ************************************* CLEAR THE ARITHMETIC UNIT: -------------------------- Only when the right vertical lever on front is on (+) ADDITION, the arithmetic unit can be cleared: Turn the little crank on the right side clockwise one rotation. ENTER A NUMBER: --------------- Use the index-finger and pull-down the appropriate number. Depending of the right vertical lever on front, the input is (+) ADDED or (-) SUBTRACTED. The result is visible in the arithmetic unit. INPUT CHECK: ------------ When the black knob on the right side is set clockwise, the input wheels will stay and show the number entered (for checking). Before entering a new number, press the key on front to release the input wheels. If the black knob is set counter-clockwise, the release key on front is locked down and each input wheel snaps back immediately after entering a number. NEGATIVE RESULTS: ----------------- Negative results are displayed in the arithmetic unit as the COMPLEMENT of the next higher 10, 100, 1000, ... Example: -12 = 9...988 impressum: ******************************************************************** © C.HAMANN http://public.BHT-Berlin.de/hamann 10/23/06 |