Smithsonian Report. 1962. — Stookey 



Plate 1 



One of the new glasses that can be changed to crystalHzed glass-ceramic. Here it is shaped 

 into a missile nose cone. In its transparent glassy state, undergoing inspection at right, 

 it is ready for heat treatment to form millions of tiny nuclei and cause crystals to grow 

 on these centers. The matured glass-ceramic has great resistance to erosion and thermal 

 stress. 



