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An early D'Arsonval galvanometer showing magnet and rotating coil. A galvanometer is an electromechanical measuring instrument for electric current.Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.
right angles in construction frequency counter: frequency of alternating current: fuel gauge: fuel levels galvanometer: electricity gas pycnometer: volume and density of solids geiger counter: ionizing radiation (alpha, beta, gamma, etc.) glucometer: blood glucose (diabetes) graphometer: angle heliometer: variation of the Sun's diameter hourmeter
A "Universal" version having additional alternating current and alternating voltage ranges was offered from 1933 and in 1936 the dual-sensitivity Avometer Model 7 offered 500 and 100 Ω/V. [12] Between the mid-1930s until the 1950s, 1,000 Ω/V became a de facto standard of sensitivity for radio work and this figure was often quoted on service ...
Manufacturing in Ethiopia was, before 1957, dominated by cottage and handicraft industries which met most of the population's needs for manufactured goods such as clothes, ceramics, machine tools, and leather goods. Various factors – including the lack of basic infrastructure, the dearth of private and public investment, and the lack of any ...
A string galvanometer is a sensitive fast-responding measuring instrument that uses a single fine filament of wire suspended in a strong magnetic field to measure small currents. In use, a strong light source is used to illuminate the fine filament, and the optical system magnifies the movement of the filament allowing it to be observed or ...
The most common uses were as recording equipment for seismometers and submarine cables used for telegraphy. In modern times, the term mirror galvanometer is also used for devices that move laser beams by rotating a mirror through a galvanometer set-up, often with a servo-like control loop. The name is often abbreviated as galvo.
An electric machine discharged just at the moment one of Galvani's assistants touched the crural nerve of a dissected frog with a scalpel. The frog's legs twitched as the discharge happened. [ 6 ] Galvani found that he could make the prepared leg of a frog (see the Construction section) twitch by connecting a metal circuit from a nerve to a ...
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.