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Bottom-Bowl is Metal, Covers of Body & Carriage are in Plastic

Have a look at the NISA »PK5«

T E C H N I C A L   D A T A       of the Mechanical Calculator       NISA-K5

Serial Number:       178102 / V4-12292 ( V4 = Year-Code = 1970/4th Quarter )

Dimensions:   (ca.)  Width   =  13_1/2" /  34 cm
                     Depth   =  12_1/2" /  32 cm
                     Height  =   6_1/2" /  17 cm

Weight:       (ca.)  10  lbs  /  4.5 kg

Mechanics:           10*10 Full-Keyboard
                     Split-Stepped Drum / Geteilte Staffelwalze 
                     10s Carry Mechanism
                     Counter Stepping Mechanism Animation

Functions:           Add, Subtract, Multiply, Divide

Registers:           Input       =  10  Decimals
                     Counter     =  10  Decimals (NO Carry; Neg.Figures RED)
                     Arithmetic  =  20  Decimals
                     Prosec/Nisa (=Neisse) , Czechoslovakia

H O W   T O   U S E    the  NISA-K5

RELEASE the REPEAT[x/:]Key by pressing the [+/-]Key above.
Shift left the lower left "ITEM-COUNTER" Key (see remark below!)
CLEAR the KEYBOARD by pressing the lower right key.
CLEAR the COUNTER unit by lifting the right lever at the carriage.
CLEAR the ARITHMETIC unit by lifting the left lever right at carriage.
Lift and shift the CARRIAGE to the far left ( = POSITION 1).

Keys [+] & [-] start Add- & Subtract-Procedure and CLEAR KEYBOARD after it.
Keys [x] & [:] start "Multiply"- & "Division"-Procedure
     same as [+] & [-]   BUT   D O   N O T   CLEAR KEYBOARD  after it.

Example:   123 + 45 - 6  =  162

ADD: Enter the first number (123) in the far right columns. 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

Example:    123 x 45  =  5535

Clear counter and arithmetic units. Press the right REPEAT-Key [x/:].

Enter the multiplicand (123) in the far right columns. The multiplicator
(45) has two digits, so the arithmetic unit is moved to position 2 with a
clockwise turn of the T-Handle in front. Repeat making positive (clockwise)
turns with the crank, until the first figure of the multiplicator (4) will
appear in the 2nd position of the counter unit. Move the arithmetic unit
with the T-Handle to position 1. 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 keyboard, the multiplicator (45) is in the counter unit and
the result (5535) is in the arithmetic unit.

Example:   22 : 7  =  3.142857142  Remainder 6

Division requires 3 steps:

(A) To Set the Dividend into Arithmetic Unit:
    For the maximum number of decimals, pull out the arithmetic unit to the
    far right position. Enter the dividend (22) in the far right columns.
    Make a positive (clockwise) turn with the crank to transfer into
    arithmetic unit.

(B) To Set the Divisor in the Keyboard:
    Clear the counter unit.
    Enter the divisor (7) below the dividend (22).
    Press the right REPEAT[x/:]Key.

(C) To Divide:
    Make negative (counter-clockwise) turns with the crank until the
    arithmetic unit shows an "underflow". Make one positive (clockwise)
    turn with the crank. Move the carriage with the T-handle to the next
    left position. Repeat this procedure until the required number of
    decimals are calculated...

    The result (3.142857142) is in the counter unit ( in RED ), and the
    remainder (6) is in the arithmetic unit. The divisor (7) stays in the
    input unit, therefore an additional decimal can be estimated ...
    ( 8, cause 8 x 7 = 56).

R E M A R K S :
The COUNTER-FIGURES ( WHITE/RED ) follows the  "MONROE-TYPE"-Scheme ...

It depends of the CRANK TYPE whether "UP" or "DOWN" is the IDLE POSITION

The lower left "ITEM-COUNTER" lever:
Because the counter has no 10s-carry, there is no "build-in" counting of the
items to add. Here the "Item-Counter" lever is useful:  When the left keys
[0]&[1] are pressed simultaniously, the left lever shifts right and locks
both keys. Now the arithmetic unit will count the items in the left column.
The "CLEAR KEYBOARD" Button will NOT clear this [0]&[1] keys!  The [0]&[1]
keys are released by shifting the left lever to the left.
( See the original idea, a simplified version, in the  MONROE LX  ...)

HOW TO OPEN THE K5 ( valid for the PLASTIC COVER version ):
 o  Set the calculator in idle state
 o  Lift & pull the carriage to the middle
 o  Remove the mini-screws of the clear-lever caps and pull them
 o  Push the lower right button and AT THE SAME TIME pull out the crank
 o  Pull the small lower left "Item-Counter" cap
 o  Push pins into both holes on the back side of the metal bottom bowl and
    to the front out of its bottom bowl  ( Beware of 2 hooks in front! )
 o  Put the calculator upside down on a soft towel
 o  Now the CARRIAGE COVER's center screw on the bottom-back 
    is accessible: Remove it! Loose the screws left and right.
    Remove the metal holders, than remove the plastic carriage cover too
 o  Put the calculator back in its bottom bowl
 o  Lift & pull the carriage to the right
 o  Remove the body's plastic cover
 o  Now all parts are accessible ...

There is a 2nd  »K5«  with METALL COVERS in the collection:
Serial Number:       178102 / X3-22092
                     ( X3 = Year-Code = 1972/3rd Quarter )
Weight:       (ca.)  11  lbs  /  5 kg


 o  There is NO NAME-TAG  »K5«  on the cover
 o  OPEN THE CALCULATOR: Start with removing the carriage cover ...

© C.HAMANN        05/15/07