THERMO-REQ ULA TORS. 



115 



When ready for use the cylinder e is filled with fluid, 

 either mercury, calcium chloride solution, alcohol and 

 ether, or a number of other substances depending upon 

 the temperature to which it is to be subjected, up to 



riG. 28. 



Mercurial thermo-regulator. 



about the level shown in the figure. It is then allowed 

 to stand or is suspended in the bath the temperature of 

 which it is to regulate. The rubber tubing coming 

 from the gas supply is attached to the outer end of the 

 glass tube a, and the tube going to the burner is slipped 

 over the branch tube b. The gas is turned on and the 



