Note 110 — Chapter XII · INVESTIGATIONS—WISE AND OTHERWISE
Reading edition
The “galvanometer” is an instrument used to control the medium. It is an electric device provided with a dial and two handles, so constructed that if the medium were to let go of either handle the contact would be broken and the dial fail to register. The medium in fooling the sitter simply placed one of the handles on the bare flesh under her knee and gripping it there with her leg kept the circuit intact and left one hand free to produce “spirits.”