HMS Dreadnought RN Submarine Clinometer.

The Royal Navy submarine inclinometer by Dewrance Co. London, Pattern 5292, from the Royal Navy’s first nuclear submarine, HMS Dreadnought. Removed during Her decommissioning in 2002.

This instrument was used to measure Vanguards angle of trim or list while submerged. Constructed with a varnished teak frame, black enamelled graduated scale and curved spirit tube. Tube was emptied of its green spirit and one of t he lamp holders was lost in the process of removal.

HMS Dreadnought (S101) was Britain’s first nuclear-powered submarine, entering Royal Navy service in 1963. Built at Barrow-in-Furness, she used an American-designed nuclear reactor combined with a British-built hull and systems. During her service, Dreadnought took part in NATO exercises, patrols and trials, demonstrating the advantages of nuclear propulsion. In 1967, she helped pursue the German freighter Essberger Chemist after it broke apart at sea. In 1971, Dreadnought became the first British submarine to surface at the North Pole. She continued operational and training duties throughout the 1970s before being decommissioned in 1980 after seventeen years of service.