From the abacus to the IBM personal computer, calculating devices have come a long way. Let's take a look through the history of these machines and the remarkable progress that came with the 20th century.
A picture above was taken at the Lewis Flight Propulsion Laboratory in Cleveland, Ohio, 1951.
The Pascaline or Pascal's Calculator, by Blaise Pascal. It could add, subtract, multiply and divide two numbers (1642)
(via David Monniaux)
The Stepped Reckoner, invented by Gottfried Wilhelm Leibniz, completed in 1694. Two prototypes were built, only one survived.
The Arithmométre, the first mass-produced mechanical calculator, by Charles Xavier Thomas de Colmar, based on Leibniz's work, around 1820, but manufactured until 1915
The punched card system, developed by 1801 by Joseph-Marie Jacquard. Used in music machines, mechanical organs, calculators, mechanical counters, looms, and other automatons and early computers.
Here you can see the Difference Engine No. 2 in a gigantic, zoomable gigapixel image.
The hand-cranked calculator Curta, invented by Curt Herzstark in 1948. Type II was introduced in 1954 and produced until 1972.
(via Werner Kratz)
The Water Integrator, that could solve (partial) differential equations, built by Vladimir Lukyanov, 1936
The water levels in the chambers represented stored numbers, and the rate of flow between them represented the mathematical operations.
The Mallock Machine, built by Rawlyn Richard Manconchy Mallock of Cambridge University to solve simultaneous linear differential equations (1933)
(via University of Cambridge)
The MONIAC or the Philips Hydraulic Computer, developed by Bill Philips to model the economic processes of the UK (1949)
Each transparent tank represented an aspect of the UK national economy and the flowing colored water symbolized the flow of money.
(via Kaihsu Tai)
Cambridge, c. 1937
Magnetic Drum Digital Differential Analyzer at the Navy Electronics Laboratory
Stibitz made this machine from scrapped relays on his kitchen table at home. It could add two binary digits.
The Z1, the first freely programmable computer, which used Boolean logic and binary floating point numbers, built by Konrad Use between 1936 and 1938
It never worked flawlessly due to problems with the precision of its parts. The Z1 was destroyed by the Allied air raids in 1943, but Zuse rebuilt it in the mid-1980s.
The engineer's later machine, the Z3 (1941) was the first working program-controlled digital computer, used to perform statistical analyses of wing flutter.
Colossus, the British codebreaker computer of WWII, developed by Tommy Flowers (Type I: 1943, Type II: 1944)
The 10 units were smashed to pieces and blueprints were burnt after WWII, but a working replica has been built between 1994 and 2006, and is on display at The National Museum of Computing.
(via Wikimedia Commons)
ENIAC – Electronic Numerical Integrator And Computer, the first electronic general-purpose computer, designed by John Mauchly and J. Presper Eckert, announced in 1946
At first the computer worked until November 9, 1946, and after a memory upgrade and a refurbishment the ENIAC was turned on again for eight more years.
(via Wikimedia Commons)
The world's first stored-program computer, the Manchester Small-Scale Experimental Machine (SSEM) or Baby, built at the Victoria University of Manchester by Frederic C. Williams, Geoff Tootill and Tom Kilburn (1946)
Twenty-six were sold of the vacuum tube computer Pegasus 1 and twelve of the Pegasus 2. A Pegasus 1 was used to calculate 7480 digits of pi, a record of its time.
The first computer to play digital music, the CSIRAC, by an Australian team led by Trevor Pearcey and Maston Beard (1949)
The commercial computer UNIVAC I, designed by John Mauchly and J. Presper Eckert, the inventors of ENIAC (1951)
The IBM's answer to the UNIVAC: the IBM 702, the first computer to use magnetic tapes, announced in 1953
More than 2000 were built.
SAGE (Semi-Automatic Ground Enviroment), designed for the Air Force to track radar data in real time (1954)
Built by the IBM to the US Air Force to analyze radar signals in North American airspace in response to the threat from Soviets.
The first computer mainframe that could complete a range of applications from scientific to commercial. 360s were used by the NASA during the Apollo missions and some airports used these as air traffic control computers.
Cray-1, the best known supercomputer ever, deisgned by Cray Research, led by Seymour Cray and Lester Davis (1976)
(via Ed Uthman)
IBM Personal Computer or Model 5150, created by a team of engineers and designers led by Don Estridge (1981)
The system that made computers mainstream.