The short-circuit key F is kept closed except when an observation is about to be made; its object is to arrest the swing of the d'Arsonval galvano 1 E.
Electro-Thermal Relations.-The Hall electromotive force is only one of several so-called " galvano-magnetic effects " which are observed when a magnetic field acts normally upon a thin plate of metal traversed by an electric current.
Sci., 1901, 12, 57), as follows: Galvano-Magnetic Effects.
These arms. are then altered until on raising or depressing the battery key there is no sudden deflection either way of the galvano meter.