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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).
A modern torpedo is an ... the invention and refinement of torpedoes from the 1860s onwards allowed small torpedo boats ... kept a torpedo level after ...
The 10" Mark 43 torpedo was the first and smallest of the United States Navy light-weight anti-submarine torpedoes. This electrically propelled 10-inch (25-cm) torpedo was 92 inches (2.3 m) long and weighed 265 pounds (120 kg). [2] Described as "a submersible guided missile", [3] the torpedo was designed for air or surface launch. The Mod 0 ...
The Y level or wye level is the oldest and bulkiest of the older style optical instruments. A low-powered telescope is placed in a pair of clamp mounts, and the instrument then leveled using a spirit level, which is mounted parallel to the main telescope. The term dumpy level (also builder's level) endures despite the evolution in design. They ...
The Black Scorpion is a full-featured acoustic homing torpedo with greater speed and endurance than its predecessor. Shallow-water performance has been enhanced, with normal operational depth stated as ranging from 30 to 200 meters when deployed from an aircraft, and a speed of at least 15 knots.
In the absence of torpedo retrievers a wide variety of small boats were pressed into recovery service. The first sinking of a ship by a self-propelled torpedo occurred in 1878, [1] and by World War I, torpedoes played a pivotal role in naval warfare as German U-boats sought to close the North Atlantic to allied shipping. While the United States ...