112 



BELL SYSTEM TECHNICAL JOURNAL 



220 200 180 160 140 120 100 80 60 40 



SAMPLE Ht- 30 MIN. 



Fig. 4 — -Relation of plasticity to per cent liquid phase in four of the solders tested. 



240 



200 



z 



2 160 



kJ 120 



140 



ISO 



170 180 190 



TEMPERATURE °C. 



200 



210 



Fig. 5 — Variation of plasticity with temperature, showing the superiority of solders 



Nos. 1, 2 and 3. 



