Abraham Bennet, the inventor of the gold leaf electro e described a doubler or machine for multiplying Bennet'.
Bennet's doubler appears to have given a suggestion to William Nicholson (Phil.
This "revolving doubler," according to the description of Professor S.
A simple and typical form of doubler, devised in 1831 by G.
9) used by him in connexion with his electrometers for maintaining their charge, closely resembles that of Belli's doubler and will be understood from fig.
He was assisted to detect the small potential differences then in question by the use of a multiplying condenser or revolving doubler (see Electrical Machine).
In the case of conductors of the first class he proved by the use of the condensing electroscope, aided probably by some form of multiplier or doubler, that a difference of potential (see Electrostatics) was created by the mere contact of two such conductors, one of them being positively electrified and the other negatively.