TECHNICAL DATA of the ElectroMechanical Calculator MONROE MODEL1 (OLD)
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Serial Number: 191.823 (engraved inside the carriercover)
Dimensions: (ca.) Width = 17 " / 43 cm
Depth = 13_1/2" / 34 cm
Height = 8 " / 20 cm
Weight: (ca.) 20_1/2 lbs / 9.5 kg
Power Supply: 110  135 V AC / DC
Mechanics: 10*10 FullKeyboard
SplitStepped Drum / Geteilte Staffelwalze
10s Carry Mechanism
Counter Stepping Mechanism + Animation
Functions: Add, Subtract, Multiply, Divide
Motorized Carriage Shifting and
DivisionAutomatic!
Registers: Input = 10 Decimals
Counter (left) = 10 Decimals (NO Carry; Neg.Figures RED)
Counter (right) = 10 Decimals (Black Figures with Carry)
Arithmetic = 21 Decimals
Manufacturer:
MONROE Calculating Machine Co.
New York / USA
1945
H O W T O U S E the (OLD) MONROE MODEL1
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BEFORE STARTING A TASK:

UNLOCK the red REPEATButton (R) by pressing and pushing it foreward.
CLEAR the KEYBOARD by pressing the lowerright red Button (0).
UNLOCK RIGHT COUNTER by pressing the button on leftside of the carriage.
CLEAR the COUNTER units by pressing down the upperright handle on carriage.
Shift the upperright red COUNTERDIRECTIONlever (x) backward. Counter
& arithmetic units are working in the same direction  otherwise, when the
lever (:) is shifted foreward, counter & arithmetic units working opposite.
CLEAR the ARITHMETIC unit by lifting the lowerright handle on carriage.
(It is intended to press both handles together at the same time.)
Bring the CARRIAGE (motorized) to the far left (= Pos.1) by pressing and
holding the left SHIFTKEY on front.
ADDITION & SUBTRACTION:

Example: 123 + 45  6 = 162
ADD: Enter the first number (123) in the far right columns. Press the
PLUSkey (+) to transfer the number into arithmetic unit. The counting
units display the figure 1. Enter the second number (45). Press the PLUS
key (+) to add the number. The arithmetic unit displays the intermediate
sum (168) and the counting units display the figure 2.
SUBTRACT: Enter the third number (6). Press the MINUSkey (). The
arithmetic unit displays the result (162) and the counting units are
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 counter and arithmetic units. LOCK the right red REPEATButton (R)
by pressing and pushing it backward.
Enter the multiplicand (123) in the far right columns. The multiplicator
(45) has two digits, so the arithmetic unit is moved to position 2 with
the right SHIFTkey on front. Repeat pressing the PLUSkey (+), until the
first figure of the multiplicator (4) will appear in the 2nd position of
the counter units. Move the arithmetic unit to position 1 with the left
SHIFTkey on front. Repeat pressing the PLUSkey (+), until the second
figure of the multiplicator (5) appears in the 1st position of the counter
units. The multiplication is done: The multiplicand (123) stays in the
keyboard, the multiplicator (45) is in the counter units and the result
(5535) is in the arithmetic unit.
DIVISION:

Example: 22 : 7 = 3.142857142 Remainder 6
Division requires 3 steps:
(A) To Set the Dividend into Arithmetic Unit:

For the maximum number of decimals, bring the arithmetic unit to the
far right position. Enter the dividend (22) in the far right columns.
Press the PLUSkey (+) to transfer into arithmetic unit.
(B) To Set the Divisor in the Keyboard:

CLEAR the counter units by pressing the upper handle on the carriage.
Shift the COUNTERDIRECTIONlever (:) forward
Enter the divisor (7) below the dividend (22).
LOCK the right red REPEATButton (R).
(C) To Divide:

Set the upper left red lever forward to divide (:) and the machine will
calculate all decimals (and moves the carriage) automatically.
The result (3.142857142) is in the counter units, and the remainder (6)
is in the arithmetic unit. The divisor (7) stays in the keyboard.
R E M A R K :
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Have a look at the HOMEMADE POWER PLUG for 220 VAC ...
impressum:
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© C.HAMANN http://public.beuthhochschule.de/~hamann 04/25/06
