previous <<==>> next

BRUNSVIGA-13RK



TECHNICAL DATA  of the Mechanical Calculator                BRUNSVIGA-13RK
**************************************************************************

Serial Number:       ???  ( missing plaque )

Dimensions:   (ca.)  Width   =  11_1/2" /  29 cm
                     Depth   =   9    " /  23 cm
                     Height  =   6_1/4" /  16 cm

Weight:       (ca.)  18 lbs  /  8 kg

Mechanics:           Pin-Wheel / Sprossenrad
                     10s Carry Mechanism

Functions:           Add, Subtract, Multiply, Divide
                     Back-Transfer / Rueckuebertragung

Registers:           Input       =  10 Decimals
                     Counter     =   8 Decimals
                     Arithmetic  =  13 Decimals
Manufacturer:
                     BRUNSVIGA
                     MASCHINENWERKE AG
                     Braunschweig
                     West Germany
                     1950


H O W   T O   U S E    the  BRUNSVIGA-13RK ...
**************************************************************************
          Make sure that the TRANSPORTATION-LOCK under [ A ] is opened !!!

BASIC SETTINGS:
===============

(a) Crank:
----------
For addition (+) the crank [7] is turned clockwise; for subtraction (-)
the crank is turned counter-clockwise. In the idle position [9] the crank
is down & locked. To make one or more turns with the crank, pull out the
handle [10] 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 [I] register
    is manipulated by 10 levers. Its content is shown in the display [D].
    The input can be cleared with the lever [18] on the left side.

The arithmetic [A] register
    is to clear with the small lever [6] on the right side.

Levers [3 & 5] are working together with the switch [20] on top.

If switch [20] is in down (.) position:
    Lever [3]  clears the counter [C] only;
    Lever [5]  clears arithmetic & counter [A & C].

If switch [20] is in up (..) position:
    Lever [3]  clears counter & input [C & I];
    Lever [5]  clears all registers [A & C & I].

REMARK:      Windows left / left / right of counter, input & arithmetic
             show a RED INDICATOR in the PROCESS of CLEARING.

(c) Shifting the Carriage:
--------------------------
With the 2-grip lever [8] (located under the crank) the carriage [13] is
movable one step right or one step left. Also with the front button [12]
either right or left - but additional continuously when pressed forward
and right or left.

The left position "1" is the "Start Position" of the carriage.

(d) Counting Direction:
-----------------------
After clearing the counter [C] a white mark [19] shows its neutral state.
It depends of the 1st turn of the crank what happens: When (for addition)
the crank's 1st turn is clockwise, the counter display [19] shows white
figures; when (for subtraction) the crank's 1st turn is counter-clockwise,
the counter display [19] shows red figures. In both cases the counter is
working with 10s-carry - and allows "Shortened Method of Multiplication".

A red cursor moves over the counter's display and shows the active
position refered to the carriage's position.

(e) Back Transfer:
------------------
For continuous multiplication the contents of the arithmetic unit
can be back transfered into the input register with this procedure:

Pull & HOLD lever [18]; pull lever [5], release [5], RELEASE [18]

    A  ==>>  I ;   A & C cleared


ADDITION & SUBTRACTION:
=======================
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 (counter-clockwise)
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 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 2-grip lever [8] 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 2-grip lever [8] 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:
=========
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 (counter-clockwise) 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, 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).


HOW TO  CLEAN  THE   A R I T H M E T I C   UNIT OF THE BRUNSVIGA-13RK  ???
==========================================================================
Bent & Cut a PaperClip appropriate to PULL-OUT the METAL COVER in [12] ...

    

... THAN A NUT is accessable ...  and the COVER OF [ A ] CAN BE REMOVEDED.

impressum:
**************************************************************************
© C.HAMANN       http://public.beuth-hochschule.de/~hamann        08/13/12