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British Mathematician also called the first computer programmer Ada Lovelace died #OTD in 1852. She is known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine. She was the first to recognise that the machine had applications beyond pure calculation.

Babbage's friend Charles Wheatstone commissioned Ada Lovelace to translate Menabrea's paper into English. She then augmented the paper with notes, which were added to the translation.

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Watercolour portrait of Ada King, Countess of Lovelace, c. 1840, possibly by Alfred Edward Chalon

Ada Lovelace's notes were labelled alphabetically from A to G. In Note G, she describes an algorithm for the Analytical Engine to compute Bernoulli numbers. It is considered to be the first published algorithm ever specifically tailored for implementation on a computer, and Ada Lovelace has often been cited as the first computer programmer for this reason. The engine was never completed and so her program was never tested. via @wikipedia

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Lovelace's diagram from "Note G", the first published computer algorithm.