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torpedo bulkhead
A torpedo bulkhead is a type of armor common on the more heavily armored warships, especially battleships and battlecruisers of the early 20th century. It is designed to keep the ship afloat even if the hull was struck underneath the belt armor by a shell or by a torpedo. After the lessons learned during World War I, many capital ships were refitted with double, triple, or even quadruple torpedo bulkheads, as well as anti-torpedo bulges to the exterior of the hull.〔Gillmer and Johnson, p.185〕 For example, the last US battleship designs during World War II had up to four torpedo bulkheads and a triple-bottom.〔 The innermost bulkhead is commonly referred to as the ''holding bulkhead'', and often this bulkhead would be manufactured from high tensile steel that could deform and absorb the pressure pulse from a torpedo hit without breaking. If the final bulkhead was at least 37mm thick, it may also be referred to as an ''armored bulkhead'', as it would be capable of stopping splinters and shells with low striking velocities.
==Footnotes==
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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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