6 4 6 



LOUIS VESSOT KING 



where K is a function, not only of the stress N normal to the plan 

 at which slide occurs, but also of the previous history of the 



Bulge 



2U* 



.005 



.OO4 



.OO3 



r ., o_- — 'r 2 



024 



6 8 10 12 14 16 18 20 W. load m 



thousand lbs. 



Bulge 

 2U' 



.OO4 



.OO3 



I ^, — 

 —i—o—< 



XT 2 



14 



16 



20 W. load in 

 thousand lbs. 



Fig. 2. — Theoretical and observed stress-strain diagrams. Curves 1, tallow 

 filling. Curves 2, Carrara marble filling. 



specimen. According to Tresca's hypothesis, K was regarded as a 

 constant, depending only on the nature of the specimen. An exten- 



