• Electroscope
  • WordNet 3.6
    • n electroscope measuring instrument that detects electric charge; two gold leaves diverge owing to repulsion of charges with like sign
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Webster's Revised Unabridged Dictionary
    • n Electroscope (Physics) An instrument for detecting the presence of electricity, or changes in the electric state of bodies, or the species of electricity present, as by means of pith balls, and the like.
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Century Dictionary and Cyclopedia
    • n electroscope An instrument for observing or detecting the existence of free electricity, and, in general, for determining its kind. All electroscopes depend for their action on the elementary law of electric forces, that bodies similarly charged repel each other, while bodies dissimilarly charged attract each other. The simplest electroscope consists of pith-balls suspended by silk threads; another simple form consists of a pair of short pieces of straw suspended by silk threads. When not in use the pieces of straw hang down, touching each other. On presenting an electrified body to them they become excited and stand apart, thus giving a test for electricity. The gold-leaf electroscope of Bennet, introduced in 1789, consists of two pieces of gold-leaf, about ½ inch broad, fixed to a brass rod and hung inside a glass globe which has been thoroughly dried, in order that the insulation of the apparatus may be as nearly perfect as possible. The globe is closed with a wooden stopper, through the center of which passes a glass tube containing the brass rod. The upper end of the rod is furnished with a knob. If an electrified body is brought near the top of the instrument, induction takes place; the top becomes electrified oppositely to the body presented, and the pieces of gold-leaf similarly. To find if the latter are positively or negatively charged, a glass rod is rubbed and brought near the knob; if positively charged, the leaves will diverge still more under the induction of the glass; if negatively, they will collapse, the negative electricity being attracted to the positive of the glass rod. In Volta's condensing electroscope, in place of the gilt knob there is a flat metal plate upon which rests another similar plate, which may be removed by an insulating handle.
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Chambers's Twentieth Century Dictionary
    • ns Electroscope an instrument for detecting the presence of electricity in a body and the nature of it
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Webster's Revised Unabridged Dictionary
Electro-, + -scope,: cf. F. électroscope,


In literature:

At any time in the drift, an electroscope exposed outside became rapidly charged.
"The Home of the Blizzard" by Douglas Mawson
The electroscope instantly responded.
"The Boy Inventors' Radio Telephone" by Richard Bonner
The electroscope at once charges up rapidly.
"The Birth-Time of the World and Other Scientific Essays" by J. (John) Joly
Will she be able to discharge a gold-leaf electroscope without touching it?
"The Shadow World" by Hamlin Garland
The quartz electroscope is taken, and the insulating rod heated in the blow-pipe.
"On Laboratory Arts" by Richard Threlfall
I have no idea how far his radiations will affect the electroscopes, but we'll try four hundred-yard intervals to start.
"Astounding Stories, May, 1931" by Various
V is a testing vessel in which an electroscope is placed.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8" by Various
To demonstrate this, use is made of an electroscope.
"A Brief Account of Radio-activity" by Francis Preston Venable
But they tell us that the electroscope does not show any signs of electrification in the evaporated moisture.
"Nature's Miracles, Volume 1" by Elisha Gray
Boltzmann used an electroscope as a detector.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2" by Various

In science:

The activities were measured with a Lauritsen-type quartz fiber electroscope. “It is thus clear the bombardment of scandium with 11 MeV α -particles gives rise to 48V, this isotope having a half-life of 16.2±0.3 days.
Discovery of the Vanadium Isotopes
The decay curves of the produced radioactivity were measured with a quartz fiber electroscope following chemical separation.
Discovery of the Iron Isotopes
The decay curves of the produced radioactivity were measured with a quartz fiber electroscope following chemical separation. “It is at once apparent that only Fe59 can be negative electron active.
Discovery of the Iron Isotopes
Pa233 radiation, for which the electroscope had been calibrated in previous work.
Discovery of the actinium, thorium, protactinium, and uranium isotopes