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In 1826, Poggendorff developed the mirror galvanometer, a device for detecting electric currents. He had an extraordinary memory, well stored with scientific knowledge, both modern and historical, a cool and impartial judgment, and a strong preference for facts as against theory of the speculative kind.
A mirror galvanometer is an ammeter that indicates it has sensed an electric current by deflecting a light beam with a mirror. The beam of light projected on a scale acts as a long massless pointer. In 1826, Johann Christian Poggendorff developed the mirror galvanometer for detecting electric currents. The apparatus is also known as a spot ...
Mirror galvanometer by James W. Queen & Company Cascade above the Basin, Franconia Mountains, N.H, by James W. Queen & Company. James W. Queen & Company was an optical and scientific instrument company located at 924 Chestnut Street, Philadelphia, Pennsylvania, with a branch office in New York City, and active in various forms from 1853 to 1925, and subsequently as Gray Instrument Company ...
Mirror galvanometer systems are used as beam positioning or beam steering elements in laser scanning systems. For example, for material processing with high-power lasers, closed loop mirror galvanometer mechanisms are used with servo control systems. These are typically high power galvanometers and the newest galvanometers designed for beam ...
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The mirror galvanometer proved yet another point of contention. Whitehouse wanted to work the cable with a very different scheme, [ 43 ] driving it with a massive high-voltage induction coil producing several thousand volts, so enough current would be available to drive standard electromechanical printing telegraphs used on inland telegraphs ...
After “Conclave” screenwriter Peter Straughan earned the Golden Globe for best screenplay on Sunday evening, he took a moment to address Megyn Kelly’s viral rant about the film. While ...
In 1870 the siphon recorder for tracing a cablegram in ink instead of merely flashing it by the moving ray of the mirror galvanometer, was introduced on long cables and became a source of profit to Jenkin and Varley as well as to Thomson, its inventor." [5]: ¶ 51 "In 1873 Thomson and Jenkin were engineers for the Western and Brazilian cable.