American Heritage® Dictionary of the English Language, Fourth Edition
- n. An instrument for measuring voltage.
Century Dictionary and Cyclopedia
- n. An instrument for measuring difference of electrostatic potential between two conductors. See potential. There are many forms. The absolute electrometer (also called
balance electrometer) of Sir William Thomson consists essentially of two parallel circular plates attracting each other, the central portion of one of them, the upper, suspended from one arm of a balance or by means of light steel springs, the other being movable to a greater or less distance from the first by means of a micrometer screw. The upper disk is always brought to a fixed position (which can be very accurately determined) by means of the attraction of the lower, the amount of attraction being regulated by the distance between the two plates. It is thus seen that the electric force is actually weighed, and formulas are given by means of which the difference of potentials is deducible in absolute measure, the areas of the plates and the distance between them being known. The quadrant electrometer of Sir William Thomson consists of four quadrant-shaped pieces of metal, sometimes segments of a flat cylindrical box, the alternate pairs being connected by a wire; above or within this, if the cylindrical form is used, a flat needle of aluminium is hung by a delicate wire. The needle is kept in a constant electrical condition by connection usually with a Leyden jar placed above or below, and if the two pairs of quadrants are dissimilarly electrified—that is, are in a state of different potential, as by connecting them respectively with the poles of a voltaic cell—the needle is dettected from its position of rest, and the amount of this deffection, as measured by the motion of a spot of light reflected from a small mirror attached to it, gives a means of calculating the difference of potential of the bodies under experiment. In another method of using the quadrant electrometer the pairs of quadrants are kept at a constant difference of potential, while that of the needle varies. Arranged in this manner, it is much used in the investigation of atmospheric electricity. Lippmann and Dewar have devised very delicate capillary electrometers, based on the alternation of the force of capillarity by electric action. See electrocapillary.
- n. a device used to detect and measure static electricity; an electroscope
- n. a precision voltmeter that draws almost no current from the circuit
GNU Webster's 1913
- n. (Physics) An instrument for measuring the quantity or intensity of electricity; also, sometimes, and less properly, applied to an instrument which indicates the presence of electricity (usually called an
- n. meter to measure electrostatic voltage differences; draws no current from the source
- electro- + -meter (Wiktionary)
“Her sensitive awareness to subtle natural effects were such that Samuel Taylor Coleridge, William's friend and fellow poet, considered her to be the equivalent of a perfect "electrometer" -- a "fragile piece of gold" able to measure tiny changes in electrical pulses.”
“In the mid-1880s, Pierre Curie had used minuscule quartz crystals to craft an instrument called an electrometer, capable of measuring exquisitely small doses of energy.”
“In the Memoirs of the Roman Academy of Sciences for 1857 he published a description of his new divided ring electrometer, which is based on the old electroscope of Bohnenberger and since then he has introduced”
“The latest case follows a complaint from two women, one of whom says she was manipulated into handing over 20,000 euros for costly products, including an "electrometer" to measure mental energy.”
“The latest case follows a complaint from two women, one of whom says she was manipulated into handing over €20 000 for costly products, including an "electrometer" to measure mental energy.”
“He also developed numerous other instruments, including the manometer, cyanometer, diaphonometer, anemometer and mountain eudiometer, the first electrometer (1766), a device for measuring electric potential by means of attraction or repulsion of charged bodies, and the first hygrometer, utilizing a human hair to measure humidity (1783).”
“She says she was pressured to spend more than $28,000 for courses, books, illegally prescribed drugs and an “electrometer” that was supposed to measure fluctuations in her mental state, according to the BBC.”
“In a postscript, he added, "I bring with me a sensitive thread electrometer with a voltammeter and my institute in Göteborg Högskola, Sweden, will provide me with the necessary resources for my work.”
“Pierre and Paul-Jacques Curie had already devised an electrometer in the early 1880s based on the piezoelectric effect of quartz crystals.”
“In the light of the new and slowly emerging field of radiation physics, Marie employed the Curie electrometer in her research, equipped it with an ionization chamber, and transformed it into a reliable tool for ionization measurements.”
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