EXPERIMENTAL RESEARCHES ON DRAm" STEEL, 
25 
Diagram VI. 
Change of magnetic intensity and temperature coefficient with lapse of time in drawn and tempered 
piano steel. 
Nos. 8a and 8b refer to the first and second samples of piano wire in the commercial state, 8 centims. long. 
Nos, 12ff and 12/^ refer to the first and second samples of tempered piano wire, 12 centims, long. 
VOL. CCI,—A 
E 
