Addiator

Sterling currency Addiator serial number M076362.
9 slides, 9 digit displays.
Subtraction on reverse.
7.1 x 4.8 inches
Brass & steel
In leathercloth wallet (distressed) with stylus.
1920s/1930s

The firm was founded by Carl Kubler (born 1875) in 1920 and started production in that year in Berlin. Production in Berlin ended in 1962, continuing in Wolfach in the Black Forest until 1974 when the firm was sold. The firm was wound up in 1975. For more details of the firm see the web site of Herrn Diestelkamp (in German) - link on the links page.

Addiator (decimal version) serial number M032017
9 slides, 9 digit displays
Subtraction on reverse
7.1 x 4.8 inches
Brass & steel
In leathercloth wallet missing stylus
1920s
Obtained from Germany

Addiator Duplex
8 slides, 9 digit displays
Subtraction on reverse
5 x 3.1 inches
Aluminium & steel
1950s/1960s
Obtained from Bulgaria.

Addiator Addimax Triplex
8 slides, 9 digit displays
Subtraction on reverse; negative capability
5 x 3.2 inches
Brass & steel
In leather case with stylus and instructions in German. New unused condition.
1970s
Obtained from Germany

Faber Castell 67/87R System Rietz Slide Rule with Addiator on reverse.
6 slides, 6 digit display
6.3 x 1.7 inches
Aluminium & steel (Addiator)
With leather case & stylus - logo for Weiger Optik on case
1949

Addiator Universal Standard
6 slides, 6 digit display
6.3 x 1.7 inches
Steel
With stylus
1960s
Obtained from USA

Addiator Arithma de luxe
6 slides, 6 digit display
6.3 x 1.7 inches
Brass & steel
With stylus & PVC sleeve
1960s
Obtained from USA
With US agent’s leaflet

Faber Castell 67/54R Darmstadt Slide Rule with Addiator on reverse
6 slides, 6 digit display
6.3 x 1.7 inches
Aluminium & steel (Addiator)
With leather case and stylus
1955

Addiator Universal
6 slides, 6 digit display; negative capability
6.3 x 1.7 inches
Brass & steel
With stylus, instructions (Harrison) and leather case
1950s/1960s
Obtained from USA

Addiator Arithma (Sterling currency)
6 slides, 6 digit display
6.3 x 1.7 inches
Brass & steel
Replacement stylus
1950s

Faber Castell 67/87Rb System Rietz Slide Rule with Addiator on reverse.
6 slides, 6 digit display, negative capability
6.3 x 1.7 inches
Aluminium & steel (Addiator)
With leather zip case & stylus
1966

Faber Castell 67/22R Business Slide Rule with Addiator on reverse.
6 slides, 6 digit display, negative capability
6.3 x 1.7 inches
Aluminium & steel (Addiator)
With leatherette slip case
1958

Whilst the Addiator for the 67/87Rb has trig formulae above and conversion factors below the slides, that for the 67/22R has diagrams illustrating financial calculations.

Addiator (Original Addimax) Addfeet Junior
6 slides, 6 digit display
6.3 x 1.7 inches
Brass & steel
With leather slip case, stylus, instructions & retail packaging
1950s
Feet (4 columns), inches, eighths

Faber Castell 1/87A Rietz Addiator slide rule. The stylus is housed in a hole at the left hand end.
6 slides, 6 digit display with negative display. Green card case. Date code 8/62.

Faber Castell 67/22Rb Disponent Slide Rule with Addiator on reverse.
6 slides, 6 digit display, negative capability
6.3 x 1.7 inches
Aluminium & steel (Addiator)
With leather zip case & stylus
1972

Addiator Supra serial no F979886
9 slides, 9 digit displays
Subtraction on reverse
7.1 x 4.8 inches
Brass & steel
Missing stylus and wallet
1930s

Addiator Standard
9 slides, 9 digit displays
Subtraction on reverse
7.1 x 4.8 inches
Brass & steel
Green leather? wallet
Missing stylus & notebook
1960s/70s

Addiator Fractomator
For feet, inches and sixteenths
9 slides, 9 digit displays
Subtraction on reverse
Negative capable
7.1 x 4.8 inches
Brass & steel
Missing stylus & case
1960s/70s

Sterling currency Addiator Duplex, 8 slides, 9 digit display, subtraction on reverse, 5 x 3.1”, brass & steel, 1950s/1960s, leather slip case and retail card box (damaged), missing stylus.

Addiator Maximator serial no. 194779
9 slides, 9 digit displays
Subtraction on reverse
Negative capable
7.1 x 4.8 inches
Brass & steel
Missing stand and other accessories
1950s/60s