TS JD Negus Brass Parallel Rule Yacht Sailboat Maritime Nautical Instrument Antique measuring tool for navigation.....Great Piece for the boat collector or enthusiast! Should polish up real nice!!

some info about the company based in the 1800's

T.S. and J.D. Negus

In 1848, Negus and his brother John D. Negus founded the firm of T.S. & J.D. Negus, which manufactured and sold maritime chronometers and nautical instruments at 140 Water Street, New York City near the East River. The firm made chronometers for the United States Navy as well as shipmasters and yachtsmen. Their instruments were among the best manufactured in the country. The firm traded as T. S. Negus & Co. in 1864 and as T.S. & J.D. Negus in 1869. The firm was described as "probably the most prolific American Chronometer manufacturer" up through the first quarter of the 20th century.[2] From 1886 to 1887, in competitive trials of chronometers at the United States Naval Observatory, located in Washington, D. C., their chronometers passed first place in a list of 45 chronometers submitted for testing. Sea captains came to the shop to purchase and have their chronometers tested, rated and certified.