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Difference Engine No. 1

Computing & Data Processing

c. 1832

Portion of Charles Babbage's calculating machine (Difference Engine No.1), built by Joseph Clement, London, 1832.

Difference Engine No.2, designed by Charles Babbage, built by Science Museum

Computing & Data Processing

1991

Difference Engine No.2, designed by Charles Babbage, 1847-1849, excludes printing mechanism. Engine built by Science Museum, completed June 1991.

Scheutz Difference Engine, third model, 1859

Computing & Data Processing

1859

Main part of Scheutz difference engine, made by Bryan Donkin & Co. in 1859

Accounting machine, National Cash Register Class 3000

Mathematics

1945-1955

National Cash Register Class 3000 Accounting machine modified to produce differences to the fifth.

Scheutz Difference Engine, third model, 1859

Computing & Data Processing

1859

Scheutz difference engine, made by Bryan Donkin & Co. in 1859