Palo Alto, CA; Oakland, CA; San Bruno CA: The Oughtred Society 1995. First Thus. , 289-310 pages. 5 3/8 x 8 1/2 inches. Tan printed wrappers, stapled. Minor wear and creasing. Near Fine. Wraps. 
A modern reprint from 1995 of the original article which was published in the Transactions of the Engineers' Society of Western Pennsylvania, Vol I Jan 1880 to June 1882. The article was read to the Society by Thacher on March 21, 1882.
In the new introduction, Bob Otnes notes that Thacher discusses the Fuller slide rule in some detail, analyzing its features. His rule was being engraved by W. F. Stanley at the time of the meeting, so he is not unsurprisingly negative about the Fuller rule.