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: 10-Block-Keyboard,
Serial-to-parallel Conversion,
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 ...
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Division Procedure:
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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
Have a look at "Calculating Trickies" ...
R E M A R K S T O R E S T O R A T I O N ...
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(1st)PHASE ( Sunday 10/17/10 )
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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 )
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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 )
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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 )
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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 ...