Smithsonian Report, 1910.—Heaton. 
Tapping Hammer 
Hydrogen 
Fusion 
T Chamber 
Pedestal 
Adjustment 
1. PRINCIPLE OF VERNEUIL’S APPARA- 
TUS FOR PRODUCTION OF ARTIFICIAL 
CORUNDUM. 
PLATE 2. 
2. “ BouLes” OF ARTIFICIAL CORUNDUM. 
3. SECTION OF NATURAL RuBy, X 10. 
