Details:

The 11 E is a simple electrical machine.  Usually motor speed is controlled via a  centrifugal switch on the motor shaft. In this machine a centrifugal brake is used.

Also different from most electrically driven machines is that for subtraction the motor is electrically reversed in stead of with a gear system.

Some sources state that it was produced until 1955, but in Büromaschinen Lexikon it is mentioned until 1961/1962.

Usage:

Addition/subtraction:   

Put the mode selector  in the  “+/-” Position.   Then, as usual, use the  “+” and  the “-“ key.

Multiplication:

Put the mode selector  in the “X” position.  Enter the 1st  number.   Then push the “+” button as many times as the  unit-digit of the second number.  Next shift the carriage one position to the left and repeat the previous action for the second digit, etc, etc.

Division:        

Put the mode selector  in the “+/-”  position.  Move the carriage to the right. Enter the  1st . Push the “+” key. Reset register II.

Next put the mode selector  in the “:” position.  Place the 2nd number under the 1st, then push the ”-” button.  Wait for the machine to finish, then push the “-” button again.  Repeat this untill you have reached the desired accuracy.

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Serial number:

Built in:

Functions:

Rotation speed:

Market-introduction:

Production until:

Price:

11-09279

unknown

Addition, Subtraction, Half-automatic Multiplication, Half-automatic Division

450 rot/min

1952

1961 (*)

Approx. DM. 860,- in 1952 (Source:  http://www.ifhbev.de/Artikel/Brunsviga_10/Brunsviga_10.htm)

(*) Some sources state that it was produced until 1955, but in Büromaschinen Lexikon it is mentioned until 1961/1962.