HAMANN   300




T E C H N I C A L   D A T A   of the  Mechanical Calculator    HAMANN  300
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                             Restoration for the » ENERGIE-MUSEUM BERLIN «

Serial Number:       101382

Dimensions:   (ca.)  Width   =  11_3/4" /  30 cm
                     Depth   =  12_1/4" /  31 cm
                     Height  =   8_1/2" /  22 cm

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

Power Supply:        220 V / 70 W  ( AC  grounded )

Mechanics:           Serial-to-parallel Conversion
                     10-Block-Keyboard
                     Switching-Latch-Wheel / Schalt-Klinke

Functions:           Add, Subtract, Multiply, Divide
                     Division-Automatic!
                     Double Back-Transfer / Rueckuebertragung

Registers:           Input       =   9 Decimals  ( Register I )
                     Counter     =   8 Decimals  ( Register II )
                     Arithmetic  =  16 Decimals  ( Register III )
Manufacturer:
                     DeTeWe
                     Deutsche Telephon Werke AG
                     Berlin / Germany
                     1953

H O W   T O   U S E    the    HAMANN  300
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(  S H O R T   I N S T R U C T I O N S  )

Keys  [ I ]                   Set / Clear Input Register  I
      [ II III ]              Clear Registers  II  &  III
        when pressing ()-left or ()-right, this register is saved
      [ <- ]  &  [ -> ]       Shift Carriage left  or  right
      [ ^ ]                   Back-Tansfer
      [ + ]   &  [ - ]        Addition  or  Subtraction
      (   )                   Counting Direction
      ( : )                   Division Procedure Key

Multiplication  as ( Short-Cut- ) Addition ...
--------------

Division Procedure:
-------------------
  o  Clear Registers  [ I ]  &  [ II III ]
  o  Set (:) Division Procedure Key
  o  Press  [ -> ]  Key  ( Carriage goes to "Division Start" )
  o  Enter Dividend  ( eg. 22 )  and
  o  Press  [ + ]  Transfer into Arithmetic Register
  o  Enter Divisor  ( eg. 07 )  and
  o  Press  [ I ]  Transfer into Input Register
  o  Press  [ <- ] Start Automatic Divisions Procedure

In case of LOOPING, PRESS & HOLD the SILVER LEVER on Carriage
To STOP DIVISION Procedure, PRESS the SMALL GREEN ( ) KEY on Carriage


R E M A R K S   T O   R E S T O R A T I O N  ...
==========================================================================

(1st)PHASE ( Sunday 10/17/10 )
------------------------------
After power connection the calculator looped endless. No control via keys.
Unpluged & opened.  SCREWS AS FEET for "Gear-Clearance" !  Powered ... 
Touching keys & levers ... Suddenly quiet ...

The string of the INPUT POSITION MARKER was damaged ...

     

        

... and had to be replaced. Observe the solid MATRIX !!!

     

TEST: Calculator worked with all functions - WOW! - Back in its case ...

(2nd)PHASE ( Monday 10/18/10 )
------------------------------
After power connection the MOTOR looped endless.  No control via keys.
Unpluged & opened, powered:  Mechanic blocked.  Touching keys & levers ...
...  N O   S U C C E S S  ...

(3rd)PHASE ( Tuesday 10/19/10 )
-------------------------------
Dismount carriage.  With "Intelligent-Try-And-Error" find blockage.
Carriage back in place.  Keyboard and most functions are working ...

    [ -> ]  [ <- ]  [ I ]  [ II  III ]  [ + ]  [ - ]  Multiplication

(4th)PHASE ( Wednesday 10/20/10 )
---------------------------------
Because the calculator seems fragil,  D E C I S I O N   M A D E :
FUNCTIONS   [ ^ ] = Back-Transfer   &   ( : ) = Division Procedure
are   N O T   R E S T O R E D   N O W  !

... Let's see what happens in the next weeks ...


impressum:
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© C.HAMANN       http://public.beuth-hochschule.de/~hamann        10/20/10