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Source: MJD’s blog post on “The Irish logarithm” (cites Wikipedia: Irish logarithm ). Apparently, Percy Ludgate (1883–1922) was an Irish amateur (was “Boy Copyist” in 1901, and “Commercial Clerk (Corn Merchant)” in 1911, later accountant), who in 1909—unaware of the work of Charles Babbage (1791–1871) and his analytical engine—designed a similar…
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