T E C H N I C A L   D A T A     of the Mechanical Calculator   MONROE LX-160
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                                                   Portable with Hard Case !

Serial Number:       665806  ( gray/gray )

Dimensions:   (ca.)  Width   =  11_1/2" /  29 cm
                     Depth   =   9_1/2" /  24 cm
                     Height  =   3_1/2" /   9 cm

Weight:       (ca.)  8     lbs  /  3.7 kg  =  Machine
                     3_1/2 lbs  /  1.6 kg  =  Hard Case

Mechanics:           8*10 Full-Keyboard
                     Split-Stepped Drum / Geteilte Staffelwalze 
                     10s Carry Mechanism
                     Counter Stepping Mechanism + Animation

Functions:           Add, Subtract, Multiply, Divide

Registers:           Input       =   8  Decimals
                     Counter     =   8  Decimals (NO Carry; Neg.Figures RED)
                     Arithmetic  =  16  Decimals
Manufacturer:
                     MONROE Calculating Machine Co.
                     Orange, New Jersey / USA
                     1960

H O W   T O   U S E    the  MONROE LX-160
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BEFORE STARTING A TASK:
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Turn MAIN CRANK in the top (idle) position.
RELEASE the red REPEAT-Button (R) by pressing the red button () above.
CLEAR the KEYBOARD by pressing the lower right red Button (0).
CLEAR the COUNTER unit by turning the carriage crank clockwise.
CLEAR the ARITHMETIC unit by turning the same crank counter-clockwise.
Lift and shift the CARRIAGE to the far left ( = POSITION 1).

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

ADD: Enter the first number (123) in the far right columns. Make a positive
(clockwise) turn with the main 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 main 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 main 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:
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Example:    123 x 45  =  5535

Clear counter and arithmetic units. Press the right red REPEAT-Button (R).

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 a
clockwise turn of the T-Handle in front. Repeat making positive (clockwise)
turns with the main crank, until the first figure of the multiplicator (4)
will appear in the 2nd position of the counter unit. Move the arithmetic
unit with the T-Handle to position 1. Repeat making positive turns with the
main crank, until the second figure of the multiplicator (5) appears in the
1st position of the counter unit. The multiplication is done: The multi-
plicand (123) stays in keyboard, the multiplicator (45) in the counter unit
and the result (5535) is in the arithmetic unit.

DIVISION:
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Example:   22 : 7  =  3.1428571  Remainder 3

Division requires 3 steps:

(A) To Set the Dividend into Arithmetic Unit:
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    For the maximum number of decimals, pull out the arithmetic unit to the
    far right position. Enter the dividend (22) in the far right columns.
    Make a positive (clockwise) turn with the main crank to transfer into
    arithmetic unit.

(B) To Set the Divisor in the Keyboard:
    -----------------------------------
    Clear the counter unit by turning the carriage crank clockwise.
    Enter the divisor (7) below the dividend (22).
    Press the right red REPEAT-Button (R).

(C) To Divide:
    ----------
    Make negative (counter-clockwise) turns with the main crank until the
    arithmetic unit shows an "underflow". Make one positive (clockwise)
    turn with the main crank. Move the carriage with the T-handle to the
    next left position. Repeat this procedure until the required number of
    decimals are calculated...

    The result (3.1428571) is in the counter unit, and the remainder (3) is
    in the arithmetic unit. The divisor (7) stays in the keyboard, therefore
    an additional decimal can be estimated...
    ( 4, cause 4 x 7 = 28).

                      Have a look at "Calculating Trickies" ...
impressum:
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© C.HAMANN            http://public.BHT-Berlin.de/hamann            01/27/06