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Title: Submarines

Essay Details

Subject: History
Author: James S
Date: June 24, 2015
Level: University
Grade: A
Length: 2 / 306
No of views: 0
Essay rating: good 0, average 0, bad 0 (total score: 0)

Essay text:

Lead ballast kept the craft upright and it was propelled by hand-operated screw-like devices. The submarine was submerged when a valve admitted sea-water into a ballast tank, and rose when the tank was emptied by a hand pump. The armament of the ship included a single gunpowder bomb with a time-fuse...

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One of the key setbacks to this innovation to warfare was it's lack of an onboard oxygen supply. Lacking this, "Bushnell's Turtle" could only remain submerged for a half hour. The reason that this type of machine was developed was because Americans were looking for a way to ambush English ships. Unfortunately though, Bushnell's Turtle was a failure in it's own right...

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