TECHNICAL DATA of the Mechanical Calculator BRUNSVIGAB
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» TRINKSBRUNSVIGA «
Serial Number: 41270 ( Chassis = 847 )
Dimensions: (ca.) Width = 13_3/4" / 35 cm ( with )
Depth = 8_1/2" / 22 cm ( its )
Height = 6 " / 14 cm ( BOARD )
Weight: (ca.) 21 lbs / 9.5 g ( with its wooden BOARD )
Mechanics: PinWheel / Sprossenrad
10s Carry Mechanism
Counter Stepping Mechanism + Animation
Functions: Add, Subtract, Multiply, Divide
Registers: Input = 9 Decimals
Counter = 8 Decimals (NO Carry; Neg.Figures RED)
Arithmetic = 13 Decimals
Manufacturer:
BRUNSVIGA MASCHINENWERKE
Grimme, Natalis & Co. AG.
Braunschweig
Germany
1910
H O W T O U S E the BRUNSVIGAB ...
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BASIC SETTINGS:
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(a) Crank:

For addition (+) the crank is turned clockwise; for subtraction () the
crank is turned counterclockwise. In the idle position the crank is down
& locked. To make one or more turns with the crank, pull out the handle
to unlock. When finished the turn(s), let the handle snap into lock again.
The locked down position only makes other functions accessible.
REMARK: Every started turn has to be finished completely!
Accidentally started turns are correctible somehow.
(b) Clearing Registers:

The input register
is manipulated by 10 levers. The input can be cleared with the
wingnut on the left side of the body.
The arithmetic register
is to clear with the wingnut on the right side of the carriage.
The counter
is to clear with the wingnut on the left side of the carriage.
(c) Shifting the Carriage:

With the 2grip lever is movable one step right or one step left.
The left position "1" is the "Start Position" of the carriage.
(d) Counting Direction:

It depends of the 1st turn of the crank what happens: When (for addition)
the crank's 1st turn is clockwise, the counter display shows white
figures; when (for subtraction) the crank's 1st turn is counterclockwise,
the counter display shows red figures. The counter has NO 10sCarry!
Under the red window it shows a (+) or ()
ADDITION & SUBTRACTION:
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Example: 123 + 45  6 = 162
Clear input, counter and arithmetic units. Carriage in position 1.
ADD: Enter the first number (123) in the far right of the input unit.
Make a positive (clockwise) turn with the crank to transfer the number
into arithmetic unit. The counting unit displays the figure 1. Enter the
second number (45). Make a positive (clockwise) turn with the crank to
add the number. The arithmetic unit displays the intermediate sum (168)
and the counting unit displays the figure 2.
SUBTRACT: Enter the third number (6). Make a negative (counterclockwise)
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:
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Example: 123 x 45 = 5535
Clear input, counter and arithmetic units.
Enter the multiplicand (123) in the far right of the input unit. The
multiplicator (45) has two digits, so the carriage is shifted to
position 2 by pressing the 2grip lever forward. Make positive
(clockwise) turns with the crank, until the first figure of the multi
plicator (4) will appear in the 2nd position of the counter unit. Shift
the carriage to position 1 by pressing the 2grip lever backward.
Repeat making positive 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) in the counter and the result (5535)
is in the arithmetic unit.
DIVISION:
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Example: 22 : 7 = 3.1428571 Remainder 3
Division requires 3 steps:
(1st) To Set the Dividend into Arithmetic Unit:

For the maximum number of decimals, pull out the carriage to the far
right position. Enter the dividend (22) in the far right of the input
unit. Make a positive (clockwise) turn with the crank to transfer
into arithmetic unit.
(2nd) To Set the Divisor into Input Unit:

Clear counter & input units.
Enter the divisor (7) above the dividend (22).
(3rd) To Divide:

Make negative (counterclockwise) turns (the counter will now show
red figures!) with the crank until the arithmetic unit shows an
"underflow". Make one positive (clockwise) turn with the crank. Move
the carriage to the next left position. Repeat this procedure until
the required number of decimals are calculated...
The result (3.1428571) is in the counter unit ( in RED ), and the
remainder (3) is in the arithmetic unit. The divisor (7) stays in the
input unit, therefore an additional decimal can be estimated ...
( 4, cause 4 x 7 = 28).
impressum:
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© C.HAMANN http://public.beuthhochschule.de/~hamann 04/13/14
