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The Battenberg course indicator is a mechanical calculating device invented by Prince Louis of Battenberg in 1892 for taking station on other vessels whose range & bearing and course & speed are known. By extension, it has a range of other functions related to relative velocity calculations. A number of versions of the device were produced and it proved particularly useful for station-keeping, such as ships moving in convoy during World War II. Manufacture of the instruments was contracted to Elliott Brothers, London.〔 Devices based on the Battenberg indicator were also developed for determining course and distance in aviation and when making allowances for aircraft drift due to winds. Instruments were also manufactured for other navies, for example in the USA. ==Mark I== Prince Louis of Battenberg employed a firm of London instrument makers to build a prototype to his design. The device comprised: * 2 ''position bars'' for setting the initial and final stations * A ''speed bar'', on which the speed of the ship (relative to the flagship) was set, and which was clamped at one end into the ''diameter grove'' by the ''speed ratio clamp'' * A ''guide bar'' * A ''circular disc'' To use the instrument, the course of the flagship was first set on the guide bar. When the initial and final stations had been set using the position bars, the speed ratio clamp was set to show the ratio of own ship speed to the speed of the flagship (if the flagship was doing 10 knots, and the manoeuvring ship had 15 knots available, the clamp would be set to "1.5"). Ensuring that the pin beneath the speed ratio clamp was set within the diameter grove, the course required to take station could then be read off the circular disc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Battenberg course indicator」の詳細全文を読む スポンサード リンク
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