Mechanical calculators

alt=Planispheric Astrolabe made of brass, cast, with fretwork rete and surface engraving|thumb|upright=1.2|North African, planispheric astrolabe. Khalili Collections|Khalili Collection. thumb|upright|A modern astrolabe made in 2013, in Tabriz, Iran.

ancient analog computer designed to calculate astronomical positions

mechanical analog computer

thumb|A Pascaline signed by Pascal in 1652 thumb|Top view and overview of the entire mechanism. This version of Pascaline was for accounting.

Automatic mechanical calculator designed to tabulate polynomial functions

proposed mechanical general-purpose computer, designed by Charles Babbage

mechanical machine for arithmetic operations for absolute calculators

electromechanical machine used to summarise information and perform accounting calculations

350px|thumb|A modern soroban. The right side of the soroban represents the number 1234567890, each column indicating one digit, with the lower beads representing "ones" and the upper beads "fives".

thumb|upright=1.3|Arithmomètre built by Louis Payen around 1887

mathematical instrument invented by John Napier

thumb|Curta Type I, on display at the Musée des Arts et Métiers, Paris. thumb|upright=1.8|A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them thumb|Curta Type I calculator, top view thumb|Curta Type I calculator, bottom view

Austrian engineer (1902–1988)

thumb|Equatorium from Johannes Schöner

thumb|upright=1.2|Model ST (1930s) thumb|upright=1.2|Prototype of the first all-electronic desktop calculator marketed by of the United Kingdom|UK

mechanical add/subtract calculator

thumb|upright=1.2|Gold jeton, Zdeněk Vojtěch Popel of Lobkowicz|Popel of Lobkowicz by Engelhart, Prague 1592, Ø

cylinder with a set of teeth of incremental lengths

digital mechanical calculator

class of mechanical calculator, usually specialized for bookkeeping calculations

first commercially successful mechanical calculator that could perform a direct multiplication

Russian model of mechanical calculator

mechanical calculator

arithmetic tool

mechanical device used to maintain a linear count

American inventor (1838–1925)

theoretical universal logical calculation framework

Italian engineer (1902–1977)

British inventor

type of mechanical calculator