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MONROE   Model-1
Have a look at NEWER MODELS


Have a look at the Restoration Procedure...

TECHNICAL DATA    of the Electro-Mechanical Calculator  MONROE MODEL-1 (OLD)
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Serial Number:    191.823  (engraved inside the carrier-cover)

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 Full-Keyboard
                  Split-Stepped Drum / Geteilte Staffelwalze 
                  10s Carry Mechanism
                  Counter Stepping Mechanism Animation

Functions:        Add, Subtract, Multiply, Divide
                  Motorized Carriage Shifting and
                  Division-Automatic!

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 MODEL-1
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BEFORE STARTING A TASK:
-----------------------
UNLOCK the red REPEAT-Button (R) by pressing and pushing it foreward.
CLEAR the KEYBOARD by pressing the lower-right red Button (0).
UNLOCK RIGHT COUNTER by pressing the button on left-side of the carriage.
CLEAR the COUNTER units by pressing down the upper-right handle on carriage.
Shift the upper-right red COUNTER-DIRECTION-lever (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 lower-right 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 SHIFT-KEY on front.

ADDITION & SUBTRACTION:
-----------------------
Example:   123 + 45 - 6  =  162

ADD: Enter the first number (123) in the far right columns. Press the
PLUS-key (+) 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 MINUS-key (-). 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 REPEAT-Button (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 SHIFT-key on front. Repeat pressing the PLUS-key (+), 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
SHIFT-key on front. Repeat pressing the PLUS-key (+), 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 PLUS-key (+) 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 COUNTER-DIRECTION-lever (:) forward
    Enter the divisor (7) below the dividend (22).
    LOCK the right red REPEAT-Button (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  HOME-MADE POWER PLUG  for 220 VAC ...

impressum:
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© C.HAMANN         http://public.beuth-hochschule.de/~hamann        04/25/06