The Millionaire (calculator)

The principle of a calculation machine with progressive transmission of tens was invented by Chebyshev and demonstrated at the 1878 World's fair in Paris.

[3] The first patented multiplying machines was due to Edmund Barbour[4] (1872), Ramón Verea[5] (1878) and Léon Bollée (1889).

Designed by Otto Steiger, a Swiss engineer, the moving carriage of the Millionaire has a 20 decimal digit accumulator that shows the product after multiplication and into which dividend is entered prior to division.

A large control knob on the upper right can be set to add, multiply, divide or subtract positions.

Patents were issued in France, Switzerland, Canada and the United States in 1893, and production started in 1893.

A detailed investigation by Gerald Saudan established that 5,099 "Millionaire" had been manufactured overall in four decades, rather than the commonly quoted 4,655 units.

The Millionaire Calculator built by Egli around 1910
Desktop Mechanical Calculators in production during the 19th century