
T E C H N I C A L D A T A of the Mechanical Calculator WALTHER WSR160 ************************************************************************* Serial Number: 191991 Dimensions: (ca.) Width = 11_3/4" / 30 cm Depth = 6_1/4" / 16 cm Height = 5_1/2" / 14 cm Weight: (ca.) 10 lbs / 4.5 kg Mechanics: PinWheel / Sprossenrad 10s Carry Mechanism Functions: Add, Subtract, Multiply, Divide BackTransfer / Rueckuebertragung Registers: Input = 10 Decimals Counter = 8 Decimals Arithmetic = 16 Decimals Manufacturer: WALTHER Bueromaschinen GmbH Werk Niederstotzingen West Germany 1968 H O W T O U S E the WALTHER WSR160 ******************************************* BASIC SETTINGS: =============== (A) Crank:  For addition (+) the crank is turned clockwise; for subtraction () the crank is turned counterclockwise. In the idle position the crank is DOWN & LOCKED. To make one or more turns with the crank, pull out the handle to unlock. When finished the turn(s), let the handle snap into lock again. The locked down position only makes other functions (ex. clearing) accessible. REMARK: Every started turn has to be finished completely! Accidentally started turns are correctible somehow. (B) Clear Counter & Arithmetic Unit in the Carriage:  Pulling down the BROWN lever RIGHT on the CARRIAGE will clear counter & arithmetic unit simultaniously  and, when released, let the carriage jump to the far left position 1 (= Start Position). EXCEPTIONS: When the WHITE lever RIGHT on the CARRIAGE FRONT is shifted right, only the arithmetic unit is cleared. When this white lever is shifted left, only the counter unit is cleared. REMARK: When this lever is shifted accidentally wrong, it can be released by lifting the little METAL lever in the MIDDLE of the CARRIAGE FRONT. EXCEPTION: When the little WHITE lever on the right side UNDER the CARRIAGE is switched foreward, the carriage will not jump (to position 1) after clearing. REMARK: At any time the arithmetic unit is presettable with the affiliated toothed wheels (16 ... 1). (C) Clear Input Unit:  The input unit will not be cleared automatically after operations. There is a pair of (white & brown) levers on top: Pulling the WHITE one will clear the input unit  and will go back when released. Pulling the BROWN lever clears also the input unit, but prepare it for "Back Transfer"... REMARK: If pulled the brown lever accidentally, it can be released by pressing the right WHITE key (RIGHT under the crank). (D) Back Transfer:  Clear the input unit with the brown lever  the white one will move too. When clearing the arithmetic unit, the former content will be transfered to the input unit, set the input levers and release the white & brown clearing levers. This is a useful feature for continuous multiplication! (E) Shifting the Carriage:  The WHITE key on the right side (LEFT under the crank) let the carriage jump to position 1 from any actual position. In pressing an arrow levers (>) or (<) the carriage will shift one step right or one step left. (F) Counting Direction:  After clearing, the white (+/) lever (on top, left) is in the middle position. Depending of the first crank turn (clockwise or counter clockwise), the (+/) lever will go either to (+) or (). In case of (+) the counter & arithmetic unit are working in the same direction; in case of () both are working opposite. ADDITION & SUBTRACTION: ======================= Example: 123 + 45  6 = 162 Clear input, counter & arithmetic units. Carriage in position 1. ADD: Enter the first number (123) in the far right of the input unit. Make a positive (clockwise) turn with the crank to transfer the number into arithmetic unit. The counting unit displays the figure 1. Enter the second number (45). Make a positive (clockwise) turn with the crank to add the number. The arithmetic unit displays the intermediate sum (168) and the counting unit displays the figure 2. SUBTRACT: Enter the third number (6). Make a negative (counterclockwise) turn with the crank. The arithmetic unit displays the result (162) and the counting unit is decreased by 1. REMARK: NEGATIVE RESULTS are displayed in the arithmetic unit as the COMPLEMENT of the next higher 10, 100, 1000, ... Example: 12 = 99...9988 MULTIPLICATION: =============== Example: 123 x 45 = 5535 Clear input, counter & arithmetic units. Enter the multiplicand (123) in the far right of the input unit. The multiplicator (45) has two digits, so the carriage is shifted to position 2 by pressing the arrow (>) lever. Make positive (clockwise) turns with the crank, until the first figure of the multiplicator (4) will appear in the 2nd position of the counter unit. Shift the carriage to position 1 by pressing the arrow (<) lever. Repeat making positive turns with the crank, until the second figure of the multiplicator (5) appears in the 1st posi tion of the counter unit. The multiplication is done: The multiplicand (123) stays in the input unit, the multiplicator (45) in the counter and the result (5535) is in the arithmetic unit. DIVISION: ========= Example: 22 : 7 = 3.1428571 Remainder 3 Clear input, counter & arithmetic units. Division requires 3 steps: (A) To Set the Divisor into Input Unit:  Enter the DIVISOR (7) in the far right of the input unit. (B) To Set the Dividend into Arithmetic Unit:  For the maximum number of decimals, pull out the carriage to the far right. Set the DIVIDENT (22) into the arithmetic unit with the affiliated toothed wheels appropriately under the divisor. (C) To Divide:  Make negative (counterclockwise) turns with the crank until the arithmetic unit shows an "underflow". Make one positive (clockwise) turn with the crank. Move the carriage to the next left position. Repeat this procedure until the required number of decimals ... The result (3.1428571) is in the counter unit, and the remainder (3) is in the arithmetic unit. The divisor (7) stays in the input unit, therefore an additional decimal can be estimated... ( 4, cause 4 x 7 = 28). impressum: ************************************************************************* © C.HAMANN http://public.beuthhochschule.de/~hamann 08/08/08 