Reconnaissance Telescopes and Heliotrope - Antiquarian bookplate from a set of plates showing 19th century survey tools in a NY State Survey Report

Illustrative plate from "The Final Results of the Triangulation of the New York State Survey, Together with a Description of the Methods Employed. Also, the Eleventh Annual Report of the Commissioners of the State Survey. Transmitted to the Legislature, March 22, 1887" - This image has been cropped to show only the illustration and caption with uniform borders. Another version is available here showing the entire original plate with larger borders.