Liquid rheostat for starting an electric motor with improved sill structure

摘要

A variable level liquid rheostat having a tubular overflow member between a starting chamber and a tank for controlling the level of electrolyte in the starting chamber. The overflow member has a closed upper end inside the starting chamber and lateral discharge orifices and communicates with the electrolyte in the tank. The overflow member produces a siphoning effect when the electrolyte level in the starting chamber is substantially above the discharge orifices for causing a sudden drop of the level in the starting chamber until the electrolyte level in the starting chamber again reaches the discharge.