American engineer (1839-1903) who served as the first Professor of Mechanical Engineering at Stevens Institute of Technology. ALS signed “R. H. Thurston,” one page, 5.25 x 8, Stevens Institute of Technology letterhead, September 23, 1884. Letter requesting a precision instrument, in full: "How promptly and at what price can you supply me with a pair of measuring screws…The instrument to measure to 1/4000th or 1/5000th cen. i.e. to be in metric measurement and measuring to as nearly the equivalent of 0.0001 inch as possible?" In fine condition.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
(inquire for price)
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
