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[12] [13] For example, the Hoxa channel into Scapa Flow was provided with two guard loops followed by eight mine loops in echelon. [14] An indicator loop gave the first warning of the 1942 attack on Sydney Harbour, when it detected the midget submarine M-14, but that signal was ignored, owing to civilian traffic in the area. The submarine was ...
Some of the Boston-area forts served as POW camps during World War II, notably Fort Andrews. [36] The US Navy also participated in defending the Massachusetts Bay area with net defenses and submarine-detecting indicator loops, including stations in Nahant (Station 1D), Gloucester (Station 1E), Scituate (Station 1C), and Provincetown. [59] [60 ...
The remaining built elements of the Royal Australian Navy (RAN) Station 9, a World War II-era indicator loop and photo-electric (PE) beam monitoring complex, are located in Myrtletown Reserve, at the end of Gannon Road near Pinkenba. The concrete control and generator hut still stand at the southeast corner of the reserve, along with a number ...
Indicator loops used with controlled mining were known as 'guard loops'. By July 1917, depth charges had developed to the extent that settings of between 50–200 ft (15–61 m) were possible. [9] This design would remain mainly unchanged through the end of World War II. [9]
A 1945 map of the East Point gun batteries. The East Point Batteries, located in Nahant, Massachusetts, were part of the Harbor Defenses of Boston during World War II. Three separate gun batteries were built: Battery Murphy (two 16-inch guns), Battery 206 (two 6-inch guns), and a temporary 2-gun battery of 155 mm artillery.
In conjunction with the loop controlled minefields in operation off Fort Bribie (of which the mine control huts at this fort were a part), this naval base involved a system of indicator loops (submerged magnetic cables that would pick up the path of a vessel passing over them on or below the surface) between Skirmish Point at Bribie and ...
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The Harbor Defenses of Portsmouth was a United States Army Coast Artillery Corps harbor defense command. [1] It coordinated the coast defenses of Portsmouth, New Hampshire and the nearby Portsmouth Naval Shipyard in Kittery, Maine from 1900 to 1950, both on the Piscataqua River, beginning with the Endicott program.