Discussion on “the liquid rheostat in locomotive service” (Hall), New York, February 9, 1916. (see proceedings for February 1916)

C. D. Knight: The ordinary industrial liquid rheostat, Fig. 1, used considerably for mine hoisting work, consists of a large tank with a chamber at the top containing the electrodes and movable weir controlled through a system of levers by the hoist operator. The position of this weir determines the level of the water.