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An electroscope can only give a rough indication of the quantity of charge; an instrument that measures electric charge quantitatively is called an electrometer. The electroscope was the first electrical measuring instrument. The first electroscope was a pivoted needle (called the versorium), invented by British physician William Gilbert around ...
Headline from the New York Times article on Szczepanik's telectroscope (April 3, 1898). Nevertheless, the word "telectroscope" was widely accepted. It was used to describe the work of nineteenth century inventors and scientists such as Constantin Senlecq, [6] George R. Carey, [7] Adriano de Paiva, and later Jan Szczepanik, who with Ludwig Kleiberg obtained a British patent (patent nr. 5031) [8 ...
An EMF meter is a scientific instrument for measuring electromagnetic fields (abbreviated as EMF). Most meters measure the electromagnetic radiation flux density (DC fields) or the change in an electromagnetic field over time (AC fields), essentially the same as a radio antenna, but with quite different detection characteristics.
In telecommunication, a measuring receiver or measurement receiver is a calibrated laboratory-grade radio receiver designed to measure the characteristics of radio signals. . The parameters of such receivers (tuning frequency, receiving bandwidth, gain) can be adjusted over a much more comprehensive range of values than other radio receive
S meter measures the signal strength processed by a communications receiver. Sensor, hypernym for devices that measure with little interaction, typically used in technical applications. Spectroscope is an important tool used by physicists. SWR meter check the quality of the match between the antenna and the transmission line.
An antique version of an electroscope. vibrator An electromechanical interrupter, part of a DC-to-AC converter in a battery-operated vacuum tube radio, or similar application. Some had additional contacts to act as a synchronous rectifier. video camera tube A family of vacuum tube devices used to pick up images and transmit them electronically.
The reception or transmission of radio waves, a form of electromagnetic radiation, to or from an antenna within a Faraday cage is heavily attenuated or blocked by the cage; however, a Faraday cage has varied attenuation depending on wave form, frequency, or the distance from receiver or transmitter, and receiver or transmitter power.
Cavallo's multiplier, from an 1890 illustration. [1] From left to right, the metal disks are the insulated charge receiver A, the insulated charge transferrer B, the insulated charge accumulator C, and the earthed disk D.