The broken plastic LEVER CAPS are replaced by colored insulator pipes

            README the New Model Identification ...

T E C H N I C A L   D A T A   of the Mechanical Calculator HAMANN-Manus
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                                  ( New Identification )  Model  » C2 «
Serial Number:       6229

Dimensions:   (ca.)  Width   =  10_1/4" /  26 cm
                     Depth   =   6    " /  15 cm
                     Height  =   6    " /  15 cm

Weight:       (ca.)  12 lbs  /  5.5 kg

Mechanics:           Switching-Latch-Wheel / Schalt-Klinke

Functions:           Add, Subtract, Multiply, Divide
                     AUTOMATED DIVISION !

Registers:           Input       =   9 Decimals
                     Counter     =   8 Decimals
                     Arithmetic  =  13 Decimals
Manufacturer:
                     DTW  ==>>  DeTeWe
                     Deutsche Telephon Werke AG
                     Berlin / Germany
                     1930

H O W   T O   U S E    the  HAMANN-Manus  » C2 «
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BASIC SETTINGS:
===============

(A) Crank:
----------
In the idle position the crank is down and locked. To make one or more
turns (clockwise only!) with the crank, pull out the handle to unlock.
When finished the turn(s), let the handle snap in the lock. The locked
down position only makes other functions (ex. clearing) accessible.

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

           The little "WINDOW" between Counter and Arithmetic Unit
           indicates OVER-/UNDERFLOW and has to be reset manually.

           The little lever under the name  » HAMANN / MANUS «
           is only for "EMERGENCY" when the crank is blocked:
           Pulling the lever allows to crank backward.

(B) Clear Input Unit:
---------------------
Press the (->) knob on top to clear the input unit. When the knob is
turned either to (Add <- ), than the input unit will be cleared after
an operation, or turned to ( -> Mult), than the input unit will not
be cleared after an operation.

(C) Clear Counter & Arithmetic Unit in the Carriage:
----------------------------------------------------
Press-Down & Hold the [:/x] lever to shift the carriage to the far
left position. This position is for clearing (and initial settings)
only - No arithmetic operations are possible in this position!

Turning the right wing nut will clear counter & arithmetic unit
simultaniously. With the left wing nut the counter unit only will
be cleared. When pressing the metal "tongue" (in the middle) while
turning the right wing nut, only the arithmetic unit will be cleared.

Only in this position it is possible to pre-set the arithmetic unit
with the affiliated toothed wheels (13 ... 1).

(D) Set the Carriage in Start Position 1:
-----------------------------------------
Push the big left horizontal lever on front one time to the right.
Pull the [:/x] front lever to [x].

(E) Set Counting Direction with the [+/-] Lever on Top to [+]
-------------------------------------------------------------
In this case counter and arithmetic unit are working in the same
direction; In case of [-] both are working opposit direction.

(F) Set the [Add/Sub] lever (under crank) to [Add]:
---------------------------------------------------
This will set the carriage / arithmetic unit in [+] state; If set
to [Sub], the carriage / arithmetic unit would be set in [-] state.
( The crank is turnable clockwise only! )

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

ADD: Enter the first number (123) in the far right of the input unit.
Make a (clockwise only!) turn with the crank to transfer input into
arithmetic unit. The counting unit displays the figure 1. Enter the
second number (45) into input unit. Turn the crank to add the number.
The arithmetic unit displays the intermediate sum (168) and the
counting unit displays the figure 2.

SUBTRACT: Switch [Add/Sub] lever to [Sub]. Enter the third number (6)
into input unit. Make a (clockwise only!) 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 registers and set (Add/Mult) knob to ( -> Mult).

Enter the multiplicand (123) in the far right of the input unit. The
multiplicator (45) has two digits, so the arithmetic unit is set to
position 2 with a push on the big left horizontal lever on front. Make
(clockwise only!) turns with the crank, until the first figure of the
multiplicator (4) will appear in the 2nd position of the counter unit.
Move the arithmetic unit to position 1 by pressing the arrow [<-] key.
Repeat making 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) is in the counter unit and the result (5535) is
in the arithmetic unit.

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

Set the (Add/Mult) knob to ( -> Mult); set the [Add/Sub] lever to [Sub].

In the "Basic Setting Position" (after clearing counter & arithmetic
unit) set the dividend (22) in the far left of the arithmetic unit
with the affiliated toothed wheels.

Shift the carriage in position 8 and push the [:/x] lever to [:].
Set the divisor (7) into input unit above the dividend (22).
Set Counting Direction Lever on Top to [-].

To devide make continuous (clockwise!) turns with the crank, until the
division is finished. The algorithm (Subtraction until underflow, Add,
Shift carriage, Continue...) is done automatically!

The result (3.1428571) can be seen in the counter unit, and the
remainder (3) is in the arithmetic unit. The divisor (7) is in the
input unit, 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           12/15/07