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SUMMIRA-7



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T E C H N I C A L   D A T A   of the Mechanical Calculator SUMMIRA-7
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Serial Number:      31865

Dimensions:  (ca.)  Width   =  5    " /  13 cm
                    Depth   =  7_1/2" /  19 cm
                    Height  =  5    " /  13 cm

Weight:      (ca.)  4_3/4 lbs  /  2.2 kg

Mechanics:          Setable Counter with Input Check

Functions:          Add, Subtract

Registers:          Input       =  7 Decimals
                    Arithmetic  =  7 Decimals
Manufacturer:
                    Paul G. Mueller
                    Roisdorf bei Bonn
                    West Germany
                    1950

H O W   T O   U S E    the  SUMMIRA-7
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CLEAR THE ARITHMETIC UNIT:
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Only when the right vertical lever on front is on (+) ADDITION, the
arithmetic unit can be cleared: Turn the little crank on the right
side clockwise one rotation.

ENTER A NUMBER:
---------------
Use the index-finger and pull-down the appropriate number. Depending
of the right vertical lever on front, the input is (+) ADDED or (-)
SUBTRACTED. The result is visible in the arithmetic unit.

INPUT CHECK:
------------
When the black knob on the right side is set clockwise, the input
wheels will stay and show the number entered (for checking). Before
entering a new number, press the key on front to release the input
wheels. If the black knob is set counter-clockwise, the release key
on front is locked down and each input wheel snaps back immediately
after entering a number.

NEGATIVE RESULTS:
-----------------
Negative results are displayed in the arithmetic unit as the
COMPLEMENT of the next higher 10, 100, 1000, ...

Example:   -12  =  9...988

impressum:
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© C.HAMANN     http://public.beuth-hochschule.de/~hamann    10/23/06