RICHARDS AND WELLS. — TRANSITION TEMPERATURE. 433 



A, Air-jacket. 



B, Bath, 83°.0. 



C, Thermostat, 32o.5. 



D, Water-jacket for ther- 

 mometer stem. 



N, Tube to supply this 

 jacket with water. 



0, Outflow from jacket. 



r, Inverting mixture. 



S, Stirring apparatus. 



T, Thermometer. 



-^ 



VOL. X.X.XVIll. — '28 



