Babbage’s Difference Engine, 1822Ada Lovelace1882-ish: Marquand circuits.Before the Computer: IBM, NCR, Burroughs, and Remington Rand and the Industry they created. By James W. CortadaPrinting Tabulator, Hollerith, 1921

Calculating

Calculating, 2

Atanasoff-Berry MachineSetting the Enigma: one of 456976 possible initial settings.Alan Turing