Mechanical Calculators


Rechenmaschinen Schickard Schuster

Johann Christoph Schuster (1759 - 1823)

was a German watchmaker and inventor of calculating machines. Schuster, the son of a farmer, went to Philipp Matthäus Hahn's watchmaking apprenticeship for two and a half years and was also familiar with the construction of calculating machines at Hahn.
                Schickard Schuster

Wilhelm Schickard (1592 – 1635)

was a German professor of Hebrew and astronomy who became famous in the second part of the 20th century after Franz Hammer, a biographer (along with Max Caspar) of Johannes Kepler, claimed that the drawings of a calculating clock, predating the public release of Pascal's calculator by twenty years, had been discovered in two unknown letters written by Schickard to Johannes Kepler in 1623 and 1624.

Curt Herzstark Curta
Curt Herzstark was an Austrian engineer.
During World War II, he was imprisoned at Buchenwald concentration camp.
There he designed plans for a mechanical pocket calculator and made a drawing of the construction of his calculator.
In Liechtenstein a factory was established to manufacture the Curta, from 1947 to 1970.

2020 J. Giesen