Noun
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.
Source: Webster's dictionaryOlder electrometers Gold-leaf electrometer Gold-leaf electroscope The gold-leaf electroscope was one of the first sensitive instruments used to indicate electric charge. Source: Internet
If high-frequency light shines on the cap, the electroscope discharges and the leaf will fall limp. Source: Internet
The Braun electroscope replaced the gold-leaf electroscope for more accurate measurements. Source: Internet
The electroscope is an important tool in illustrating the photoelectric effect. Source: Internet
This type of electroscope usually acts as an indicator and not a measuring device, although it can be calibrated. Source: Internet
This will discharge a negatively charged electroscope and further charge a positive electroscope. Source: Internet