Dating in lv

Portsmouth Lightship underwent a number of technological improvements over the course of its service.

It was one of only two such rounded-hull lightships ever constructed.The ships illuminating apparatus first consisted of a 500 mm lens with six flash panels set in a rotating motion by weight-driven clockwork.The light itself was derived from a kerosene lamp of 24,000 candlepower set inside a cylindrical lantern.LV 101 was built by Pusey and Jones of Wilmington, Delaware for 8,507.The vessel is 102 feet in length and displaces 360 tons of water.

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