The Stanhope Demonstrator: An Instrument for Performing Logical Operations. Separately-paginated offprint from: Mind, Vol. IV

by Robert Harley

$1,500 · Offered by Sophia Rare Books

First edition · Signed

Aberdeen: A. King & Co., 1879. First edition, extremely rare separately-paginated offprint, inscribed by the author, of the first published description of “the world’s first logic machine” Martin Gardner , designed by Charles Stanhope, third Earl Stanhope, in the 1770s. “His system consisted essentially in the reduction of both positive and negative propositions to a single form, that of the identity of two

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