Home > Mechanical Calculators
A selection of Mechanical calculators:
The basic operating principles of mechanical calculators changed little from the end of the 19th century to their obsolescence in the 1970s, though there were many developments in the mechanisms and the materials used. This site shows representative examples of the different types.
Models made before the end of the 19th century are very rare and are usually only to be seen in museums and pictured in books. These include the Pascaline invented by Blaise Pascal, and the Stepped Reckoner invented by Leibniz, both in the 17th century, and Charles Xavier Thomas's Arithmometer in the 19th century.
The mechanical calculators featured here are typical machines which were ousted by the cheap electronic calculators which were gradually developed during the 1960s and early 1970s.
Note that the larger mechanical machines were not intended as personal calculators but would have been used in company accounting departments, technical institutions, or similar. Also they did not appear for sale to the general public in stores but were generally sold to companies by representatives of the manufacturer or through a distributor.
For information about the mechanisms of mechanical calculators see the Calculator Technology section.
For photographs of other mechanical calculators see the Mechanical Calculator Photo Library.
Click on an image below for larger pictures and technical details -
Odhner
Invented 1874: featured model 1935 - 1945
Rotary pinwheel calculator.
Comptometer
Invented
1884: featured machine is Model J, Sterling currency, 1926 - early 1940s
Full-keyboard key-driven calculator.
Addiator
Invented 1889: featured model 1920s - 1930s
"Troncet" type stylus pocket calculator.
The Millionaire
1889 - 1935
Direct multiplying machine.
Addometer
1900s - 1960s
Dial stylus calculator.
Golden Gem
1900s -
Chain adder.
S & N / The SUN
1910 -
Chain adder.
Monroe LN-160X
First model 1911: featured model 1950s - 1960s.
Stepped gear calculator with full keyboard.
Brunsviga 10
Mid 1930s.
Compact design of stepped gear calculator.
Curta I
1947 - 1970s
Hand-held stepped gear calculator.
Facit C1-13 & ESA-01
1950s - 1960s
Hand driven & electrically driven, keyboard-set, pinwheel calculators.
Marchant Figurematic
1950s - 1960s
Electrically driven, full-keyboard calculator with automatic, high-speed multiplication and division.
Plus Adder
1950s - 1960s
Minimalist abbreviated-keyboard key-driven calculator.
Madas
1950s - 1960s
Electrically driven, full-keyboard stepped-gear calculator with automatic multiplication and division.
Burroughs Add-lister
1960s
Full-keyboard add-lister.
Wheel Adding Machines - Resulta, Countess, addipresto
1950s-early1970s
Wheel adding & subtracting machines.
Olivetti Elettrosumma 22 and similar models
1950s
Electrically driven 10-key add-lister.
Muldivo Mentor / Walther WSR-160
1960s
Rotary pinwheel calculator, with improved setting mechanism.
Nippon Calculator / Busicom HL-21
1960s
Rotary pinwheel calculator.
Smith-Corona-Marchant 1011 SB
1960s
Electrically driven, 10-key add-lister.
Sumlock Comptometer 993s
1964
A very late Comptometer design, electrically driven, with memory register.
Kingson Four-Rule and Faber-Castell
combined Addiator and Slide-rule models
1960s - early 1970s
A combined "Addiator" and Slide-Rule.
Imperial Office Master
1970
A very late mechanical 10-key add-lister.
Addiator Addfeet Junior
to 1980s
Feet
& Inches Addiator.
This is only a small sample of mechanical calculators. There were many more models from many manufacturers.
For more featured non-decimal machines see the Non-decimal Calculators section.
For featured British mechanical calculators see the associated British Vintage Calculators site.
Mechanical calculating machines date from the early 1600s - see the Calculator Time-line Section. Many of the early ones are very rare and are only to be seen in books and museums.
Due to the high cost of the early electronic calculators, many mechanical calculators like the later ones shown here were produced into the early 1970s. They were ousted when cheap LSI (Large-Scale Integration) electronics became available - see the electronic calculator sections.
For photographs of other mechanical calculators see the Mechanical Calculator Photo Library.
Vintage Calculators
Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.