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ADDO   MULTO - 13


                  Have a look at the Restoration Procedure ...

TECHNICAL  DATA   of  the   Mechanical  Calculator     ADDO   » MULTO-13 «
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Serial Number:       13-12363

Dimensions:   (ca.)  Width   =  11    " /  28 cm
                     Depth   =   6_1/2" /  17 cm
                     Height  =   5_1/4" /  13 cm

Weight:       (ca.)  12_1/3 lbs  /  5.6 kg

Mechanics:           Pin-Wheel / Sprossenrad
                     10s Carry Mechanism
                     Counter Stepping Mechanism Animation

Functions:           Add, Subtract, Multiply, Divide
                     Back-Transfer / Rueckuebertragung

Registers:           Input       =  10 Decimals
                     Counter     =   8 Decimals  ( NO 10s-Carry )
                     Arithmetic  =  13 Decimals
Manufacturer:
                     A.B. ADDO
                     Malmo
                     Sweden
                     1955

H O W   T O   U S E   the  ADDO  » MULTO-13 «
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BASIC SETTINGS:
===============
                     
(a) Crank:
----------
For addition (+)  the crank [C] 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.

REMARK:      Every started turn has to be finished completely!
             Accidentally started turns are correctible somehow.

(b) Clearing Registers:
-----------------------
I N P U T :
    Set by 10 levers, the content is shown also in the display.
    In operation the levers and its displays (!) rotate.
    To clear the input regster pull the lever [A] over the crank.

A R I T H M E T I C   &   C O U N T E R :
    Pull the big lever [E] right on the carriage.

C O U N T E R   O N L Y :
    (1st) pull the ( vertical, small ) silver lever [F] right in front of
    the carriage and (2nd) pull the big lever [E] right on the carriage.

(c) Shifting the Carriage:
--------------------------
Push or pull the twin-lever [D] under the crank and the carriage will move
one step left or right.  When the black button [K]  right in front of the
base is pressed,  the carriage jumps left in position "1"  by force of a
spring. Position "1" is the "Start Position".  The carriage can be shifted
quick to the right by hand.

(d) Back Transfer:
------------------
For continuous multiplication the contents of the arithmetic unit can be
back transfered into the input register with the following procedure:

Pull the input-clear lever [A] & HOLD it. Push the SMALL LEVER [B] right
of the input unit. RELEASE the input-clear lever [A]. Now on front of
the carriage a BACK-TRANSFER INDICATOR shows (1st) in the WINDOW [G] a
RED FLAG and (2nd) the LEVER (H) under it is LIFTED. Pull the arithmetic
clear-lever [E]. The former content of the arithmetic register is now
transfered back into the input register and has set its levers and
displays accordingly.                            ===>>    R E M A R K :
The back-transfer can be interrupted by pushing down the LIFTED LEVER [H].

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  =  3.1428571  Remainder 3

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 (3.1428571) 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 the Restoration Procedure ...
impressum:
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© C.HAMANN        http://public.beuth-hochschule.de/~hamann       02/20/12