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A tubular spirit level A bull's eye spirit level mounted in a camera tripod. A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical . Two basic designs exist: tubular (or linear) and bull's eye (or circular).
In most cases, the bomb run needed to be only 30 seconds long. [15] Despite this success, the design also demonstrated several serious problems. In particular, the gyroscopic platform had to be levelled out before use using several spirit levels, and then checked and repeatedly reset for accuracy.
The Mark 48 was initially developed as REsearch TORpedo Concept II (RETORC II), one of several weapons recommended for implementation by Project Nobska, a 1956 summer study on submarine warfare. [9] The Mk-48 torpedo was designed at the end of the 1960s to keep up with the advances in Soviet submarine technology.
It was produced from 1885 to 1895, and it ran straight, leaving no wake. A Torpedo Test Station was set up in Rhode Island in 1870. The Howell torpedo was the only United States Navy model until an American company, Bliss and Williams secured manufacturing rights to produce Whitehead torpedoes. These were put into service for the U.S. Navy in 1892.
The Mark 54 lightweight torpedo (formerly known as lightweight hybrid torpedo, or LHT) is a standard 12.75-inch (324 mm) anti-submarine warfare (ASW) torpedo used by the United States Navy and several other nations armed forces.
A Mark 14 torpedo on display at Fisherman's Wharf in San Francisco A Mark 14 torpedo on display in Cleveland, near USS Cod. The Mark 14 torpedo was the United States Navy's standard submarine-launched anti-ship torpedo of World War II. This weapon was plagued with many problems which crippled its performance early in the war.