# What is the function of the dippers in a slip ring liquid starter?

The liquid starter is one that uses a washing soda solution and water in a tank. From what I've read, the dippers are attached to a shaft controlled by a small motor to lower the dippers into the solution and thus vary the resistance. I'd like to know what these dippers do and how they affect the change in resistance of the rotor circuit. Also, where in the system are the electrodes and what role do they play?

R = $\rho L\over A$ will apply if the configuration has a constant cross section, otherwise the calculations will be more complex.