TECHNICAL DATA  of the  Electro-Mechanical Calculator   RHEINMETALL  »MATHEMATON«
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MODULAR CONCEPT:  2 UNITS CONNECTED BY CLIPS ON BOTH SIDES / SEPARATION w/o TOOLS
!!! UPPER UNIT can be used as MANUAL CALCULATOR w/o Lower Unit (= Motor Unit) !!!
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Serial Numbers:      10660 = UPPER UNIT = Calculator ( right, under Carriage )
                     10660 = LOWER UNIT = Motor-Unit ( in middle of floor )

Dimensions:   (ca.)  Width   =  15" /  38 cm
                     Depth   =  13" /  33 cm
                     Height  =   9" /  23 cm

Weight:       (ca.)  33 lbs  /  15 kg

Power Supply:        110 V AC/DC

Mechanics:           8*10 Full-Keyboard
                     Stepped Drum / Staffelwalze 

Functions:           Add, Subtract, Multiply, Divide

Registers:           Input       =   8  Decimals
                     Counter     =   8  Decimals
                     Arithmetic  =  17  Decimals
Manufacturer:
                     RHEINMETALL
                     Soemmerda/Thueringen,
                     Germany
                     1935

S T A T U S  after Cleaning, Oiling, Adjusting, Repair ...
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R E M A R K S :   o  With the 3-ARMS-KNOB the CARRIAGE can be stepped right/left
---------------   o  When the BIG KNOB (left-top) PUSHED back
                     and/or the LEVERs (right-top) pinched,
                     the CARRIAGE is FREE MOVABLE right/left
                  o  Left of KBD:   LEVER up = "MULT";  down = "DIV"
                  o  Right of KBD:  KEY (R) = REPEAT (= lockable )
                                red KEY ( ) = CLEAR KBD
                  o  Right SIDE:  "CRANK" for MANUAL Processing
                  o  Small LEVER in front of Crank ???
                  o  Front, down:  Orange KEY [ : ] START "Auto-Div-Mode" ...
                     ... works with BIG & SMALL LEVERS on Left Side

 (A)  TEST UPPER UNIT ALONE  as  M A N U A L  CALULATOR:
      --------------------------------------------------
           (! "Cranking" only clockwise possible !)

      ADDITION, when "MULT":   Counter = POS ;  Arithmetic = POS
      SUBTRACTION, when "DIV": Counter = POS ;  Arithmetic = NEG
                              !=============!
        Repeat(R)-Key = DOWN = Keyboard cleared  (R) = LOCKED ...
               (pull) = UP   = Keyboard NOT CLEARED after procedure
                              !====================!

         37037037  3x(+)  ==>  11111111  = ok
                   3x(+)       22222222  = ok 
                   3x(-)       11111111  = ok
                   3x(-)       00000000  = ok

         22/7  =  3.1428571  Remainder 3   to perform with
                  Preset: 22 / 7  and  "DIV"  and  "ShiftCariage" ...
             (!!! NOT using "Underflow ... Reverse ..." -Procedure !!!)

 (B)  M O T O R  Unit connected:
      --------------------------
   (B1)  R E M A R K S :
         ===>> All (A) TESTS are to perform WITHOUT POWER-CONNECTION !!!
         "CRANK" is BLOCKED !!! RELEASED, when [ + ] or [ - ] is pressed 

   (B2)  WHEN  P O W E R E D , then [ + ] or [ - ] is performed by MOTOR

         !!!  A T T E N T I O N  !!!
         ---------------------------
         TEST  Lever "MULT" (up)
                      [ + ]  ==>  Counter = POS ;  Arithmetic = POS
                      [ - ]  ==>  Counter = NEG ;  Arithmetic = NEG

               Lever "DIV" (down)
                      [ + ]  ==>  Counter = POS ;  Arithmetic = NEG
                      [ - ]  ==>  Counter = NEG ;  Arithmetic = POS

         R E M A R K :
         22/7  with  "DIV",  [ + ]  and  "ShiftCariage"  to perform ...
               (!!! NOT using "Underflow ... Reverse ..." -Procedure !!!)
               (!!! NOT "Auto-Div-Mode" KEY activated !!!)

   (B3)  When central/front [ : ]-KEY is pressed for motorized DIVISION:
         !!!  TEST  22/7 in "Auto-Div-Mode" is   N O T  WORKING  N O W  !!!
                                                !=========================!
         R E M A R K :
         To   S T O P   L O O P I N G :   PULL the down-left Lever!

         !!!  There is a "BAD-Stop-Mode" with blocked "MULT/DIV"-Lever !!!
              Pull UPPER-LEFT "STICK" under Carriage!
              (= automatic +/- change in "Auto-Div-Mode" !)
         !!!  May be  R E P E A T  Procedure more times if necessary !!!
  
         E R R O R   A N A L Y S I S :
         -----------------------------
         Using the "MANUAL-Mode" (= NO POWER !) in "Auto-Div-Mode" ...
         The "Underflow" with 10s-Carry is NOT RUNNING TO THE LEFT-END !!!
         It stops RANDOMLY in between = NOT TRIGGER the "Reverse"-Procedure !!!

         TESTS:   0000...000 - 1  =  9999...999
         ------   9999...999 + 1  =  0000...000   show the SAME RANDOM ERRORS ...

         ===>>>   INVISIBLE  MisFunction between CARRIAGE and underlaying GEARS !

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         ???  N E X T  ???

                     SnapShots of the RESTORATION ...
impressum:
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© C.HAMANN              http://public.BHT-Berlin.de/hamann               02/10/20