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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 use of steam was necessary for reducing heat levels to an acceptable level (500-600°C). Initial experiments with a 750-horsepower test unit revealed a problem with the use of seawater: the extreme conditions in the combustion chamber would cause the deposition of salt on the injector nozzles, partially or totally blocking them.
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 ...
Instead of explosives, the exercise head has a tape recorder for logging a number of torpedo functions, communication with fire-control and hit indications. After each run, the recordings are analysed and torpedo and fire-control functions are checked. The Torped 45 is set to be replaced by the newer Torped 47 in Swedish Service fully 2024.
The plate level is then used, rotating it 90 degrees between readings to level the instrument more precisely. The Fell All-Way precision level, one of the first successful American made bull's eye levels for machine tool use, was invented by William B. Fell, Rockford, Illinois prior to World War II in 1939. [ 1 ]
In 1989 a new torpedo project by Japan, G-RX4, was launched to develop the necessary upgrades and start making prototypes. By 1997 the new torpedo was approved and put into service and is called the Type 97. The torpedo is now equipping the JMSDF P-1 and P-3 ASW aircraft as well as filling the Mark 32 torpedo tubes on surface ships.
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.
During World War I, computing a target intercept course for a torpedo was a manual process where the fire control party was aided by various slide rules [13] (the U.S. examples were the Mark VIII Angle Solver (colloquially called the "banjo", for its shape), and the "Is/Was" circular sliderule (Nasmith Director), for predicting where a target ...
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