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Ballast tanks : ウィキペディア英語版
Ballast tank

A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide stability for a vessel. Using water in a tank allows for easier adjustment of weight than stone or iron ballast as was used in older vessels. It also allows for ballast to be pumped out to temporarily reduce the draft of the vessel when required to enter shallower water.
==History==
The basic concept behind the ballast tank can be seen in many forms of aquatic life, such as the blowfish or argonaut octopus,〔(Discovery Blog: Scientists solve millennia-old mystery about the argonaut octopus )〕 and the concept has been invented and reinvented many times by humans to serve a variety of purposes. For example, in 1849 Abraham Lincoln, then an Illinois attorney, patented a ballast-tank system to enable cargo vessels to pass over shoals in North American rivers.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Ballast tank」の詳細全文を読む



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