A mechanical calculator made in Switzerland.  Used by car rallyists back in the day.

A mechanical calculator made in Switzerland. Used by car rallyists back in the day.

History of Mechanical Calculators - Part I

History of Mechanical Calculators - Part I

Mechanical calculators

Mechanical calculators

TypeII-1 Curta. The Curta is a very cool machine, designed by Curt Herzstark while incarcerated in a Nazi concentration camp! This amazing little machine can add, subtract, divide, multiply, fit in your pocket, grind pepper, predict the weather, and unlike those boring electronic calculators, the Curta has ten billion moving parts!

TypeII-1 Curta. The Curta is a very cool machine, designed by Curt Herzstark while incarcerated in a Nazi concentration camp! This amazing little machine can add, subtract, divide, multiply, fit in your pocket, grind pepper, predict the weather, and unlike those boring electronic calculators, the Curta has ten billion moving parts!

Friden Model STW-10 Electro-Mechanical Calculator... I used one of these on my first job.

Friden Model STW-10 Electro-Mechanical Calculator... I used one of these on my first job.

History of Computers and Computing, Mechanical calculators, 19th century, George Barnard Grant

History of Computers and Computing, Mechanical calculators, 19th century, George Barnard Grant

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