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Have a look at the Restoration Procedure of an OLDER VERSION ...

T E C H N I C A L   D A T A   of the Mechanical Calculator HAMANN-Manus
                                                           Model  » R «
Serial Number:       45656

Dimensions:   (ca.)  Width   =  10_1/2" /  27 cm
                     Depth   =   6_1/2" /  17 cm
                     Height  =   6    " /  15 cm

Weight:       (ca.)  13_1/4 lbs  /  6 kg

Mechanics:           Switching-Latch-Wheel / Schalt-Klinke

Functions:           Add, Subtract, Multiply, Divide
                     Back-Transfer / Rueckuebertragung (= "R" )

Registers:           Input       =   9 Decimals
                     Counter     =   8 Decimals
                     Arithmetic  =  13 Decimals
                     Deutsche Telephon Werke AG
                     Berlin / Germany

H O W   T O   U S E    the  HAMANN-Manus  » R «


(A) Crank:
In the idle position the crank is down and locked. To make one or more
turns (clockwise only!) with the crank, pull out the handle to unlock.
When finished the turn(s), let the handle snap in the lock. The locked
down position only makes other functions (ex. clearing) accessible.

REMARKS:   Every started turn has to be finished completely!
********   Accidentally started turns are correctible somehow.

           The little lever under the name  » HAMANN / MANUS «
           is only for "EMERGENCY" when the crank is blocked:
           Pulling the lever allows to crank backward.

(B) Clear Input Unit:
Input is to clear with the "Over-All"-Lever. When the small red lever, the 
"Add/Mult-Lever", on the handle is pulled-out [ + / - ], the input will be
cleared after every crank operation.  When the red lever is pushed-in
[ x / : ] clearing is up to the operator.

(C) Clear Counter & Arithmetic Unit in the Carriage:
Clearing can be done in all positions of the carriage with the TWIN-
Levers on the right side of the carriage: The left one clears the counter,
the right one clears the arithmetic unit.

(D) Set the Carriage in Start Position 1:
Pull the [ : / x ] front lever to [x] and push the [->] key once.

(E) Set Counting Direction with the [+/-] Lever on Top (left) to [+]
In this case counter and arithmetic unit are working in the same
direction; In case of [-] both are working in opposit direction.

(F) Set the [Add/Sub] Lever (under crank) to [Add]:
This will set the carriage / arithmetic unit in [+] state; If set
to [Sub], the carriage / arithmetic unit would be set in [-] state.
( The crank is turnable clockwise only! )

(G) Clear Back-Transfer Mode:
Push the silver lever on top ( "Back-Transfer-Switch", right )
until the yellow mark left of the input-display-window disapears.

Example:   123 + 45 - 6  =  162

ADD: Enter the first number (123) in the far right of the input unit.
Make a (clockwise only!) turn with the crank to transfer input into
arithmetic unit. The counting unit displays the figure 1. Enter the
second number (45) into input unit. Turn the crank to add the number.
The arithmetic unit displays the intermediate sum (168) and the
counting unit displays the figure 2.

SUBTRACT: Switch [Add/Sub] lever to [Sub]. Enter the third number (6)
into input unit. Make a (clockwise only!) 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 registers and set "Add/Mult-Knob" to [ -> x ].

Enter the multiplicand (123) in the far right of the input unit. The
multiplicator (45) has two digits, so the arithmetic unit is set to
position 2 with a push on the [->] key . Make (clockwise only!) 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 to position 1 by pressing the [<-] key. Repeat making 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, the multiplicator (45)
is in the counter and the result (5535) is in the arithmetic unit ...

Example:   123 x 45 x 67  =  370845   ( ... continue Example above )

... The intermediate result 5535 in the arithmetic unit has to be
transfered back into the input: Push the "Input-Clear-Lever" with
the thumb to its end-position AND PRESS with the index-finger the
silver "Back-Transfer-Switch" until the yellow mark is visible left
of the input-display-window. Release the "Input-Clear-Lever" and the
"Back-Transfer-Switch". Now pull the "Arithmetic-Clear-Lever" and
the content of the arithmetic unit is transfered into the input and
the arithmetic unit is cleared.  Clear counter unit and continue
multiplication with 67 as usual  ...
  ( OR see TRICKIES: "Short-Cut-Mult." [ +1 -3 -3 ] is possible !)
... The multiplicand (5535) stays in the input, the multiplicator (67)
is in the counter and the result (370845) is in the arithmetic unit.

Example:   22 : 7  =  3.1428571  Remainder 3

Set the (Add/Mult) knob to ( -> Mult); set the [Add/Sub] lever to [Sub].

In the "Basic Setting Position" (after clearing counter & arithmetic
unit) set the dividend (22) in the far left of the arithmetic unit
with the affiliated toothed wheels.

Shift the carriage in position 8 and push the [:/x] lever to [:].
Set the divisor (7) into input unit above the dividend (22).

To devide make continuous (clockwise!) turns with the crank, until the
division is finished. The algorithm (Subtraction until underflow, Add,
Shift carriage, Continue...) is done automatically!

The result (3.1428571) can be seen in the counter unit, and the
remainder (3) is in the arithmetic unit. The divisor (7) is in the
input unit, therefore an additional decimal can be estimated...
( 4, cause 4 x 7 = 28 ).

© C.HAMANN      12/12/14