TECHNICAL DATA      of the Electro-Mechanical Calculator  MONROE  »Model-1«
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Model:              LA5-160

Serial Number:      582612   ( grey/grey )

Dimensions:  (ca.)  Width   =  11_1/2" /  29 cm
                    Depth   =  11    " /  28 cm
                    Height  =   6_1/2" /  17 cm

Weight:      (ca.)  14 lbs  /  6.5 kg

Power Supply:       110 - 135 V AC / DC

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

Functions:          Add, Subtract, Multiply, Divide
                    Division-Automatic!

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  »Model-1«
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BEFORE STARTING A TASK:
-----------------------
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:
-----------------------
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
unit displays 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 unit displays the figure 2.

SUBTRACT: Enter the third number (6). Press the MINUS-key (-). 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 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 pressing the PLUS-key (+),
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 pressing the PLUS-key (+), 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 keyboard, the
multiplicator (45) is in the counter unit and the result (5535) is in the
arithmetic unit.

DIVISION:
---------
Example:   22 : 7  =  3.1428571  Remainder 3

Division requires 3 steps:

(A) To Set the Dividend into Arithmetic Unit:
    -----------------------------------------
    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.
    Press the PLUS-key (+) 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:
    ----------
    Set the upper left red toggle lever to divide (:) and the machine will
    calculate all decimals (and moves the carriage) automatically.

    The result (3.1428571) is in the counter unit ( in RED ), 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).

Have a look at "Calculating Trickies" ...

( * )  R E M A R K S   t o   R E S T O R A T I O N  . . .
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This machine was destroyed in 2003 on its flight to Germany by the crude
handling of the "AIRPORT SECURITY" in SanFrancisco or Paris Airports. The
machine was taken out of its secure shock-proof packaging and put back in
the box without the wrappings. The carrier was able to move during transit
and destroyed its gearing system.

The response of AIR FRANCE was "That's not our fault..." - NO COMPENSATION!
AS  A  W A R N I N G  FOR  OTHER  COLLECTORS  I  placed  this  MESSAGE  !!!

Lucky I was, I got a " D O N A T O R " :  My friend Cliff found an older
» MONROE-1 «  -  It was not working and it did not have automatic division.
But I was able to use it for an "ORGAN TRANSPLANTATION" ...
     Have a look at the  P R O C E D U R E  of the OLDER MODEL-1 ...
... After hours of work ( the gear distances were slightly different ) the
"Operation" was successfully completed:  THE MACHINE IS NOW WORKING AGAIN !

     Have a look at the  HOME-MADE POWER PLUG  for 220 VAC ...

PS.: The Picture on the 1 US$ Note is George Washington

impressum:
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© C.HAMANN           http://public.BHT-Berlin.de/hamann            07/07/07