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Late 19th or early 20th century. This galvanometer was used at the transatlantic cable station, Halifax, NS, Canada Modern mirror galvanometer from Scanlab. 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 ...
J. J. Thomson. In 1896, J. J. Thomson performed experiments indicating that cathode rays really were particles, found an accurate value for their charge-to-mass ratio e/m, and found that e/m was independent of cathode material. He made good estimates of both the charge e and the mass m, finding that cathode ray particles, which he called ...
Thomson noted that no depth-sounding apparatus was available on the ship to assist the operation. [4] During 1872, on board his own sailing yacht Lalla Rookh and the cable-laying ship CS Hooper , Thomson conducted trials of a sounding machine, with the main improvement over existing practice being the use of piano wire instead of hemp rope for ...
The Apple Music soundtrack to your 2023 is now available. Year-end insights for Apple Music subscribers, more collectively known as Apple Music Replay, went live Nov. 28, spotlighting users' top ...
A vibration galvanometer is a type of mirror galvanometer, usually with a coil suspended in the gap of a magnet or with a permanent magnet suspended in the field of an electromagnet. The natural oscillation frequency of the moving parts is carefully tuned to a specific frequency; commonly 50 or 60 Hz. Higher frequencies up to 1 kHz are possible.
Grass Valley (formerly known as Thomson Grass Valley and Grass Valley Group) is a manufacturer of television production and broadcasting equipment. Headquartered in Montreal, Quebec, it was formed by the March 2014 merger of the original Grass Valley with Miranda Technologies, which were both acquired by American networking company Belden in 2014 and 2012, respectively.
John Mansfield Thomson (10 March 1926 – 11 September 1999) was a New Zealand musicologist who specialized in early music and the Music of New Zealand. [ 1 ] [ 2 ] He is known for founding the Early Music journal and for publications on his country's music, such as the 1991 The Oxford History of New Zealand Music .
Leopoldo Nobili, born on 5 July 1784 [1] in Trassilico and died on 22 August 1835 [1] in Florence, was an Italian physicist who invented a number of instruments critical to investigating thermodynamics and electrochemistry.