RICHARDS AND WELLS. — TRANSITION TEMPERATURE. 445 



A, Air-jacket. 



B, Bath, 53.1°. 



C, Hot Thermostat. 



D, Water-jacket for ther- 

 mometer stem. 



N, Tube to supply this 

 jacket with water. 



0, Outflow from jacket. 



P, Inverting mixture. 



S, Stirring apparatus. 



T, Thermometer. 



Figure 2. Apparatus employed. 



