its Relations to Temperature. 



15 



the (elastic) effect of cooling from T to room temperature (7"). 

 In both figures and text the abbreviation "An." is used for 



-3 30 



"0' fo i k ir &~ \'f ' 



"annealed." An. 190° denotes, for instance, that the glasshard 

 steel rod is annealed at 190° until further change of temper is 

 practically imperceptible. Figures 2 to 5 and tables A and 1 



