The Collaborative International Dictionary
Condensing electroscope
Electroscope \E*lec"tro*scope\, n. [Electro- + -scope: cf. F. ['e]lectroscope.] (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.
Condensing electroscope (Physics), a form of electroscope in which an increase of sensibility is obtained by the use of a condenser.