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MERCEDES-EUKLID 22



In 2006 the EUKLID-22 came as "Motor is humming - but nothing works..."
Restoration is not only a matter of skills - also of patience:
Have a special look at the (missing) left [+] key: Hand-Made !

Have a look at the Restoration Procedure...

(*) Spring 2017 = New Picture:
Collector-Friend G.B. asked me to correct my wrong KEY-SEQUENCE ...
Right Sequence:   Br-Br-Wr-Wr-Wb-Bw-Bw-Br-Wb-Wb-Wb-Bw-Bw
( B;b = black / W;w = white / r = red )

TECHNICAL DATA  of the  Electro-Mechanical Calculator    MERCEDES-EUKLID
************************************************************************
Invented by CHRISTEL HAMANN in 1906                         Model » 22 «

Serial-Number:       24943

Dimensions:   (ca.)  Width   =  14_1/2" / 37 cm
                     Depth   =  14_1/2" / 37 cm
                     Height  =   6_3/4" / 17 cm

Weight:       (ca.)  34 lbs / 15.5 kg

Power Supply:        220 V / 100 W (grounded, AC )

Mechanics:           13*9 Full-Keyboard
                     Proportional-Lever / Proportional-Hebel

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

Registers:             I  Counter     =   8 Decimals
                      II  Arithmetic  =  16 Decimals
                     III  Input       =  13 Decimals
Manufacturer:
                     MERCEDES BUEROMASCHINEN WERKE
                     Zella-Mehlis in Thueringen
                     Germany
                     1933

BASICS  &  HOW TO USE  the  MERCEDES-EUKLID 22
**********************************************

(A) Clearing Registers:
-----------------------
The upper right keys [I],[II],[III] clear registers: (I)&(II) by motor
power; key [III] clears the keyboard manually. In addition there is a
lever located in the middle below the case: In the left position the
keyboard will be cleared totally; in the right position the clearing
is incomplete: 6 columns on the right side keep their key positions.

The right [M/A] repeat-lever (up="M"=Multiplication, down="A"=Addition)
works with the right [+] & [-] keys: In its (A) position the input (III)
register will be cleared after each (+) or (-) operation, but in (M)
position the input is hold - The [+] or [-] keys on the left side 
don't clear the input, undependent of the repeat lever position.

(B) Shifting the Carriage:
--------------------------
The upper left keys [<-] or [->] shift the carriage by motor power to
the left or to the right.

(C) Carriage Settings & Counting Directions:
--------------------------------------------
The arithmetic register (II) is PRE-SETable with 16 metal knobs on top
of the calculator. The [COR] key, left beside the keyboard, controls the
counter (I) and has 3 positions: When not pressed (= DEFAULT), register
(I) counts "positive"; when pressed in full (I) counts "negative" and
in half-position register (I) doesn't count at all. "Positive" means
the counter & arithmetic unit are working in the same; in case of
"negative", both are working in opposite direction. To release the key,
push it horizontally. 

Prior to each task the registers (I), (II), (III) have to be cleared;
Default settings: Carriage in the leftmost position, repeat-lever down.

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

ADD: Enter the first number (123) in the far right columns. Press the
right [+] key to transfer the number into arithmetic unit. The counting
unit displays the figure 1. Enter the second number (45). Press the
right [+] 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 right [-] 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

If the right [+] or [-] keys will be used, set the repeat-lever to "M".

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 [->] key. Repeat pressing the [+] 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 [<-] key to pos. 1. Repeat pressing
the [+] 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:
    -----------------------------------------
    Clear registers [I], [II], [III].
    For the maximum number of decimals, shift the carriage to the
    far right position, using [>] key. PRE-SET the dividend (22) in
    columns 9 & 8 of the arithmetic unit with the KNOBS on TOP.

(B) To Set the Divisor in the Keyboard:
    -----------------------------------
    Enter the divisor (7) right ( columne 1 ) of the input unit,
    below the dividend (22).

(C) To Divide:
    ----------
    Press the (upper, left) Divide [DIV] key and the machine will
    calculate all decimals (and moves the carriage) automatically.

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

R E M A R K S :
===============
(a) Pressing the [DIV] key shift the carriage automaticaly to the
    far-right position at first - BUT: To make sure, that divident
    and divisor are right aligned, this feature is not used here!
(b) In case of a looping machine (e.g. dividing through zero),
    "touch" the [/DIV] key to release the [DIV] key ...
(c) The [/DIV] key calculates the 9-COMPLEMENT.

(*) Collector-Friend G.B. asked me to correct my wrong KEY-SEQUENCE ...
--------------------------------------------------------------------------
    On BBST-Meeting, 6th May 2017, Gerwin Bertelmann gave the  T A L K :
    »LEVER N-D OF THE MERCEDES-EUKLID 21/22 + BLACK-RED & WHITE-RED KEYS«

    In front of the Keyboard is the LEVER [N/D] ( N=Normal; D=Division ).
    When set to "N" and the LEVER [M/A] on the right side is set to "A",
    than ALL KEYS will be DELETED when pressed [+] or [III] Key.

    In Position "D" only the "LEFT HALF" of the KEYBOARD is CLEARED,
    ( means "LEFT-OF-THE BLACK-RED COLUMNE" ) - The right half stays !!!

    APPLICATION  =  DIVISION:  SET LEVER [N/D] to "D" & Lever [M/A] to "A"
    ======================================================================
                                             Example:  355/113 = 3.1415929

       

    Set DIVIDENT in LEFT SIDE & Set DIVISOR in RIGHT SIDE of the KEYBOARD.
    PRESS [+] Key: Divident & Divisor will be in the Arithmetic (II) Unit,
    Counter (I) Unit is set to "1" and Divident-KEYS (= left) are DELETED,
    Divisor-KEYS (= right) STAY. PRESS [-] Key: Divisor will be deleted in
    Arithmetic (II) Unit; the "1" will be deleted in the Counter (I) Unit.
    PRESS [DIV] KEY to activate AUTOMATIC DIVISION ... 355/113 = 3.1415929
                                                         "THANK YOU! G.B."
impressum:
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© C.HAMANN        http://public.beuth-hochschule.de/~hamann       06/06/17