118 



BELL SYSTEM TECHNICAL JOURNAL 



POROUS 



WIPING SOLDER 



65% Pb. - 35% Sn. 



AIR COOLED TO 210° C. 



AND QUENCHED 



LARGE 

 CRYSTALS 



It-. 







NON — POROUS 



WIPING SOLDER 



60% Pb. - 40% Sn. 



AIR COOLED TO 200° C. 



AND QUENCHED 



SMALL 

 CRYSTALS 



Fig 8-The porosity of wiping solders as related to the crystal size of samples air 

 cooled to equivalent consistencies and quenched. 



