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In order to act as effective daymarks they were painted red, with the station name in large white letters on the side of the hull, and a system of balls and cones at the masthead for identification. The first revolving light was fitted to the Swin Middle lightvessel in 1837: others used occulting or flashing lights.
In addition to information on lighted aids to navigation and sound signals in foreign waters, the NGA List of Lights provides information on storm signals, signal stations, racons, radiobeacons, and radio direction finder calibration stations located at or near lights. Publication number 117, Radio Navigational Aids, is the primary source for ...
Light vessel no. 90 90: 25 Sep 1937: Philip and Son 838: South Goodwin: 27 Nov 1954 [52] Sank in a storm in 1954 with the loss of all lives except one. [50] [51] Helwick 91: 1937: Philip and Son 839: Humber [54] (from 1937 until 1971), Helwick (from 1971 until 1977) 1977: Now an exhibit in the National Waterfront Museum in Swansea. [53] Light ...
The harbour defence motor launch (HDML) was a 72 ft (22 m) long British-designed motor vessel used for harbour defence during World War II. Nearly 500 were built by numerous Allied countries during the war. The HDML was designed by W J Holt at the Admiralty in early 1939.
During many of the earliest research cruises aboard RV Platessa (in the 1940s) scientists used a Secchi disk to assess light penetration (turbidity) in the southern North Sea. Recently, Cefas scientists re-discovered 469 historical Secchi depth measurements in survey logbooks, collected in 1931, 1937, 1946–50, and 1968.
In 1974, the Admiralty Ensign was renamed the Government Service Ensign (a.k.a. the Government Service Blue Ensign) and was flown by all Ministry of Defence-owned vessels that were not part of the Royal Navy, RFA or RMAS, as well as certain Government operated vessels for which no other ensign was appropriate.