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HAMANN-MANUS   » D «
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*)   Have a look at the Restoration Procedure...
            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  » D «
Serial Number:       8400

Dimensions:   (ca.)  Width   =  10_1/4" /  26 cm
                     Depth   =   6    " /  15 cm
                     Height  =   6_1/4" /  16 cm

Weight:       (ca.)  13 lbs  /  6 kg

Mechanics:           Switching-Latch-Wheel / Schalt-Klinke

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

Registers:           Input       =   9 Decimals
                     Counter     =   8 Decimals
                     Arithmetic  =  13 Decimals
Manufacturer:
                     DTW  ==>>  DeTeWe
                     Deutsche Telephon Werke AG
                     Berlin / Germany
                     1935

H O W   T O   U S E    the  HAMANN-Manus  » D «
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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 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!

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

The right lever clears the arithmetic unit. With the left lever the
counter is to clear also in all other positions of the carriage.

*)  R E M A R K :   It is the PURPOSE OF THE COGBAR IN THE BASE to
                    set the carriage right for clearing arithmetic
                    unit in all positions - BUT - It doesn't work
                    for all possible conditions and positions ...

(D) Set the Carriage in Start Position 1:
-----------------------------------------
Pull the [:/x] front lever to [x] and push the [->] key once.

(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 in 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 [->] key . 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 [<-] 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, the multiplicator (45)
is in the counter 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).

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 ).

R E M A R K S :
=======================================================================
The MANUS »D« came in green WOODEN BOX, original from the manufacturer,
as the DTW BRAND proofs ...
  

... and the CARRIAGE has the same  SN = 8400  as its BASE.

impressum:
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© C.HAMANN    http://public.beuth-hochschule.de/~hamann    (*) 12/12/08