Image of the calculating machine created by with a camera, oversized pocket watch, and framed portrait, presumably of the inventor Frederick Warren (1839-1875). "J.M. Paxson, Photographer." and "Warren Bro's. Calculating Engine. F.P. Warren, Inventor. Duplicates of this view, sent on receipt of twenty five cents. Address Warren Brothers, Three Oaks, Mich. This machine is capable of working under nearly all of the rules of arithmetic, performing complicated mathematical calculations in a surprising manner. It is probably the most intricate and complicated piece of mechanism ever constructed, and yet works with ease and accuracy; Containing over 2,100 specially formed pieces, and including screws rivets, etc. over 3,000. It runs backwards as well as forwards, will detect and show an error, were it possible for one to occur. It will divide one number by another, add the quotient to another number, subtract, or multiply, according to choice, at one operation. The Engine is the result of about ten years of labor. Constant and severe study upon it hastened the inventors death which occurred, April 9th, 1875. Entered according to act of Congress in the year 1875, by Warren Bros' in the Office of the Librarian of Congress at Washington."--text, printed on verso. Title and date transcribed from item verso.
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