584 



BELL SYSTEM TECHNICAL JOURNAL 



60 



50 



40 



Y?. 30 



S 20 



A = 5 SPECIMENS REMOVED AFTER 

 100,000,000 REVERSALS 



B = 3 SPECIMENS REMOVED AFTER 

 35,000,000 REVERSALS 



o ANNEALED MATERIAL 



A 4 NOS. HARD " 



□ 10 H II U 



10° 10^ I 



NUMBER OF REVERSALS 



Fig. 6— Relation of Fibre Stress to Reversals, Alloy B Nickel Silver, No. 24 



B. & S. Gauge. 



50 



40 



30 



20 



u- 10 



10' 



10' 



NUMBER OF REVERSALS 



Fig. 7 — Relation of Fibre Stress to Reversals, Alloy C Phosphor Bronze, 

 No. 24 B. & S. Gauge. 



