THE PROTRACTING COMPASS OF AUGUSTE COEURET — THE “Goniométrographe”
Stock Number: 9277
FOR SALE: Antique, late 19th century, most unusual protracting compass for use in surveying, calculating ,plotting etc. Made of bright plated brass, with a compass and twin pivoting arms. Complete with the instruction sheet and case for this complex instrument.
6-3/4" (11 cm) long closed
C. late 19th century
Country of manufacture
THE PROTRACTING COMPASS OF AUGUSTE COEURET, French, late 19th century. This fine instrument measures 6-3/4” (17cm) long (closed), constructed of bright plated brass with twin pivoting arms, one carrying a pinhole sight, the other a cross sight and glazed compass. The arms are beveled with sharp straight edges in line with the center of rotation, one arm graduated every 0.5 mm from 0 to 9 cm. The compass has a circumferential degree scale for the needle, and semicircular degree scale for an internal inclinometer pendulum for vertical use. The underside is flat for direct plotting or for alignment on a chart. Condition is excellent except for a break in the glass. It is complete with the original instruction sheet and fitted case, the latter fair only.
Auguste Coeuret was professor of military science, book author in 1884. His fine little instrument was designed to make surveys, produce rapid sketches, plan itineraries, etc., and was given the fancy name “Boussole-rapporteur-autométrique” or “Goniométrographe”! $550.
Ask the Dealer
David and Yola Coffeen both have enjoyed academic careers, as planetary astronomer and as linguist/educator. But since 1982 (yes, 1982!) they have been full-time dealers in early scientific and medical instruments, under the name Tesseract. Selling primarily by catalogue (over 100 issued so far) they also have a web presence at www.etesseract.com, and can be contacted at firstname.lastname@example.org.