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USS Glacier (AGB-4)
USS ''Glacier'' (AGB-4) (later USCGC ''Glacier'' (WAG/WAGB-4)) was a U.S. Navy, then U.S. Coast Guard icebreaker which served in the first through fifteenth Operation Deep Freeze expeditions. ''Glacier'' was first icebreaker to make her way through the frozen Bellingshausen Sea, and most of the topography in the area is named for her crewmembers. When built, ''Glacier'' had the largest capacity single armature DC motors ever installed on a ship.〔Janes Fighting Ships 1979-80, Captain John E Moore (ed), Janes Yearbooks, London, 1979. ISBN 0-354-00587-1〕 ''Glacier'' was capable of breaking ice up to thick, and of continuous breaking of thick ice at .
Named for Glacier Bay, Alaska, the USS ''Glacier'' (AGB-4) was launched on 27 August 1954 at Ingalls Shipbuilding Corp., Pascagoula, Mississippi, sponsored by Mrs. Roscoe F. Good; and commissioned on 27 May 1955, CDR. E.H. Mayer USN, Commanding. ''Glacier'' is the only icebreaker built in the Glacier class, and was in U.S. Navy service for 11 years, and U.S. Coast Guard service for 21 years.
== Construction ==
The Glacier was essentially an improved Wind-class icebreaker, larger and more powerful. Like them, her entire hull was designed for great strength. With a relatively short length in proportion to the great power developed, her bow had the characteristic sloping forefoot that enabled her to ride up on heavy ice and break it with the weight of the vessel. The stern was similarly shaped to facilitate breaking ice while backing down. The sides of the icebreaker were rounded, with marked tumble home, and she had fore, aft and side heeling tanks that enabled the ship to break free from ice by heeling from side to side and changing trim fore to aft. Diesel electric machinery was chosen for its controlability and resistance to damage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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