97 



'€^' 





Fiu-. 14. — Chilled piece of Figs. 11 and 



12 reheated to 240° C. for 2 hours. 



X 100 



An inspection of the table and photomicrographs shows that appreciable 

 jrrowth and segregation take place even at temiieratures as low as 225°, 

 this temperature being practically at the lower boundary of the area of for- 

 mation of e-tin-copper and near the lower boundary of the 7-tin-antimony 

 lan^e. As this temperature is well lielow the liquidi for both binary systems 

 involved in the alloy here used it will readily be seen that practical melting 

 and casting of bearings of Bal)bitt metal is necessarily done at consid- 

 erably liigher temperatures, thus offering correspondingly greater oppor- 

 tunity for crystal growth and segn'gation. It may be remarked that Galla- 

 glier found* a very slight crystal growth after several weeks heating at 21S° 

 C. a temperature below the solidi for b(»tb binary systems. 

 *J. Phys. Chem., 10, 93 (1906). 



