THERMO-REGULATORS. 



95 



the level shown in the cut. 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 



FIG. 18. 



the tube going to the burner is slipped over the branch 

 tube b. The gas is turned on and the burner lighted 

 and placed under the bath. The gas now streams 

 through the tube a into the cylinder e and out at b 

 to the burner, but as the temperature of the bath 

 rises, the fluid contained in the cylinder e, under 



