MARCHANT (B) STANDARD Have a look at the MARCHANT » H9 « ... Have a look at the Restoration Procedure ... |
T E C H N I C A L D A T A of the Mechanical Calculator MARCHANT (B) STANDARD ******************************************************************************* Serial Number: 4329 Dimensions: (ca.) Width = 18_1/2" / 47 cm ( with ) Depth = 10 " / 25 cm ( its ) Height = 6 " / 15 cm ( BOARD ) Weight: (ca.) 26 lbs / 57 kg ( with its wooden BOARD ) Mechanics: Pin-Wheel / Sprossenrad 10s Carry Mechanism + Animation Functions: Add, Subtract, Multiply, Divide Registers: Input = 9 Decimals Counter = 10 Decimals (NO Carry; Neg.Figures RED) Arithmetic = 18 Decimals Manufacturer: MARCHANT Calculating Machine Co. Oakland, California / USA 1917 H O W T O U S E the MARCHANT (B) STANDARD ************************************************** This old machine needs a lot of force to operate ! BASIC SETTINGS: =============== (a) Crank: ---------- For addition (+) the crank is turned clockwise; for subtraction (-) the crank is turned counter-clockwise. In 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 the lock again. The locked down position only makes other functions accessible. REMARKS: It is possible to lock the handle in its "pull-out position". -------- Every started turn has to be finished completely! Accidentally started turns are correctible somehow. (b) Clearing Registers: ----------------------- Procedure to clear the input: Shifting the LEVER under the input to the left will close the lower ends of the "input-slots". Turn the crank clockwise until all input- levers are reset because of this new barrier in the "input-slots". Than release the LEVER and finish the clockwise turn. In order to erase this "count" you may make immediate a "subtract" (-) counter- clockwise turn with the crank and than let it snap into the lock. The counter unit will be cleared with the WING-NUT on the LEFT SIDE of the carriage The arithmetic register will be cleared with the WING-NUT on the RIGHT SIDE of the carriage (c) Shifting the Carriage: -------------------------- Pushing the LEFT or RIGHT KEY on front will move the carriage one step left or one step right. When the CENTER LEVER is pulled, the carriage can be moved continuously right or left by hand. The left position "1" is the "Start Position" of the carriage. ADDITION & SUBTRACTION: ======================= Example: 123 + 45 - 6 = 162 Clear input, counter and arithmetic units. 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 (counter-clockwise) 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 and 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. 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. Repeat making positive turns with the crank, until the second figure of the multiplicator (5) appears in the 1st position 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 = 3.142857142 Remainder 6 Division requires 3 steps: (1st) To Set the Dividend into Arithmetic Unit: ----------------------------------------------- For the maximum number of decimals, pull out the carriage to the far right position. Enter the dividend (22) in the far right of the input unit. Make a positive (clockwise) turn with the crank to transfer into arithmetic unit. (2nd) To Set the Divisor into Input Unit: ----------------------------------------- Clear the counter. Enter the divisor (7) above the dividend (22). (3rd) To Divide: ---------------- Make negative (counter-clockwise) 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 (3.142857142) is in the counter units, and the remainder (6) is in the arithmetic unit. The divisor (7) stays in the input unit, therefore an additional decimal can be estimated ... ( 8, cause 8 x 7 = 56 ). impressum: ******************************************************************************* © C.HAMANN http://public.beuth-hochschule.de/~hamann 11/15/12 |