An 1840 work by Charles Babbage. Mentioned in 1 Timeline moment.
General plan of the Analytical Engine (Plan 25) is an 1840 work by Charles Babbage.
Charles Babbage, General plan of the Analytical Engine (Plan 25), 6 August 1840, as displayed at the Computer History Museum. Photograph by Arnold Reinhold, 2018, via Wikimedia Commons (CC BY 4.0).