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MERCEDES-EUKLID 29


The picture shows the status after the division 22:7 = 3.14287  rem. = 5


T E C H N I C A L   D A T A    of   the    MERCEDES-EUKLID  Model » 29 «
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Invented by CHRISTEL HAMANN in 1906

Serial-Number:       36698

Dimensions:   (ca.)  Width   =  12_1/2" / 32 cm
                     Depth   =  15    " / 38 cm
                     Height  =   7    " / 18 cm

Weight:       (ca.)  26_1/2 lbs / 12 kg

Mechanics:           9*9 Full-Keyboard
                     Proportional-Lever / Proportional-Hebel

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

Registers:             I  Counter     =   6 Decimals
                      II  Arithmetic  =  12 Decimals
                     III  Input       =   9 Decimals
Manufacturer:
                     MERCEDES BUEROMASCHINEN WERKE
                     Zella-Mehlis in Thueringen
                     Germany
                     1935


BASICS  &  HOW TO USE  the  MERCEDES-EUKLID 29
**********************************************

(A) Clearing Registers:
-----------------------
The upper right levers clear the register I = Counter & II = Arithmetic.
Register III = Input = Keyboard will be cleared with Key [L].  Key [Add]
has two positions: Pushed down & foreward to (A = Addition) the keyboard
will be cleared after operation  -  Pulled up to (M= Multiplication) the
keyboard will NOT be cleared after operation  ( = "Repeat" Function ).

(B) Shifting the Carriage:
--------------------------
The carriage has to be shifted to the right by hand.  Shift to the left
is performed step-by-step with the  SILVER LEVER  left beside the crank.

(C) Carriage Settings & Counting Directions:
--------------------------------------------
The arithmetic register (II) is PRE-SETable with 12 metal knobs on top
of the carriage.  Lever I  ( left beside the keyboard )  controls the
counter (I) and has 2 positions: When set to (+), register (I) counts
"positive"; When set to (-) register (I) counts "negative".  "Positive"
means the counter & arithmetic unit are working in the same; in case of
"negative", both are working in opposite direction.

Prior to each task registers (I), (II) & (III) have to be cleared;
Default settings:  Carriage in the leftmost position,  Key [Add] to (A),
Levers I & II to (+),  Key [DIV] pulled-up to (Norm).

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

ADD: Enter the first number (123) in the far right columns.  Pull the
handle and turn the crank  ( clockwise only! )  to transfer the number
into arithmetic unit.  Let the crank snap into the lock.  The counting
unit displays the figure 1.  Enter the second number (45).  Turn 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). Switch Lever II to (-). Turn the
crank ( clockwise only! ) to subtract the number.  The arithmetic unit
displays the result (162) and the counting unit displays the figure 3.

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 * 45  =  5535

Clear  I & II & III,  pull Key [Add] to (M),  Levers I & II to (+).

Enter the multiplicand (123) in the far right columns of the keyboard.
The multiplicator (45) has two digits, so the arithmetic unit has to be
moved to position 2 by hand. Turn the crank until the first figure of
the multiplicator (4) will appear in the second position of the counter.
Move the arithmetic unit with the silver lever to position 1. Turn the
crank until the second figure of the multiplicator (5) will appear in
the first position of the counter.  The multiplication is done:  The
multiplicand (123) stays in the keyboard, the multiplicator (45) is in
the counter unit and the result (5535) is in the arithmetic unit.

DIVISION:
=========
Example:   22 : 7  =  3.14285  Remainder 5

Clear Registers  I & II & III,   pull Key [Add] to (M),
push Key [DIV] to (Div) ... this forces Levers  I to (-)  &  II to (+)

Division requires 3 steps:

(A) Set the Dividend into Arithmetic Unit:
    --------------------------------------
    For the maximum number of decimals, shift the arithmetic unit to
    the far right position by hand.  PRE-SET the arithmetic unit with
    the divident (22) in position 7..

(B) Set the Divisor in the Keyboard:
    --------------------------------
    Enter the divisor (07) right into keyboard below the dividend (22).

(C) Divide:
    -------
    Turn the crank until it stops! The division procedure is automated:
    Subtractions until "Underflow", Addition, Carriage, Subtractions ...
    The result (3.14285) is in the counter (I) unit, and the remainder
    (5) is in the arithmetic (II) unit.  The divisor (7) stays in the
    keyboard, therefore an additional decimal can be estimated ...
    ( 7, cause 7 x 7 = 49 ).

R E M A R K S   T O   R E S T O R A T I O N :
========================================================================
The CRANK-REST was broken during transport and had to be restored: Using
a brass sheet support, holding the "Horse-Shoe" with 2-Component-Glue...

      

impressum:
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© C.HAMANN       http://public.beuth-hochschule.de/~hamann      06/27/11