1. MICROSTRENGTH OF GLASS *
2. 3Stephen Timoshenko, and J. N. Goodier , Theory of Elasticity , 2d cd. , p.376 . McGraw-Hill Book Co., Inc., New York, 1951 . 376 pp.
3. 4Private communicationfromH. Kolsky of Brown University, Providence, R. I.
4. Indentation Strength of Glass