58 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 



Fig. 29. — General scheme for the electric regulation of bath temperature. 



(Ci), (C2), and (C3) condensers spanning spark-gaps of thermostat and relays; (li), (1 2 ). and (I3) 

 lamps spanning the same spark-gaps as the condensers; (R) the master relay (250 ohms 

 resistance), which is operated by battery and may control any number of stoves in parallel; 

 (Ri) stove relay operated by battery through the "local" of the master relay, (a with arrows) 

 course of current through battery, thermostat and "main" of master relay, (6 with arrows) 

 course of current through battery, "local" of master relay and "main" of stove relay. 

 Current of main line passes through "local" of stove relay and stove. "Stops" of all relays 

 reversed. 



