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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).
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 ...
Turning is a term used when referring to moving the level to take an elevation shot from a different location. To "turn" the level, one must first take a reading and record the elevation of the point the rod is located on. While the rod is being kept in exactly the same location, the level is moved to a new location where the rod is still visible.
The homing systems for torpedoes are generally acoustic, though there have been other target sensor types used. A ship's acoustic signature is not the only emission a torpedo can home in on; to engage U.S. supercarriers, the Soviet Union developed the 53–65 wake-homing torpedo. As standard acoustic lures can't distract a wake homing torpedo ...
Wake behind a vessel of the German navy Soviet 53-65K torpedo developed during the Cold War. Wake homing is a torpedo guidance technique based on the wake trajectory left behind a moving target. [1] The torpedo is fired to cross behind the stern of the target ship, through the wake.
The initial impact of the acoustic torpedo in the Battle of the Atlantic prior to the widespread deployment of counter-measures cannot be overstated. The German U-boats now had an effective "fire and forget" weapon capable of homing-in on attacking escorts and merchant ships and doing so in close quarters of only three or four hundred yards. [1]
At least 3 dead after damaging EF3 tornado levels homes in Oklahoma. Thomas Leffler. April 19, 2023 at 7:13 PM ... That twister was also the most recent EF5 tornado to occur in the United States ...
The newer Type 12 torpedo is based on the Type 97 torpedo body and shares numerous elements of its construction. Thus, as of 2024, the Type 97 is being gradually decommissioned, with parts being salvaged for production of new Type 12 units. [citation needed] Specifications: [19] Entered service: 1997
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