ON THE MECHANICAL PROPERTIES OF METALS. 

 Experiment IX. — Eighth Melting. 



Ill 



The great weight required to fracture the specimens in this experiment 

 gave rise to suspicion that something might be wrong with the apparatus or 

 the weights on the lever. On careful inspection everything was found cor- 

 rect, and it appeared difficult to account for the discrepancy. On examina- 

 tion it was however found to be a closer and harder metal than its prede- 

 cessor, and comparing this with Experiment XXIII. on the transverse strain, 

 it will be found, from the deflection, that the former is softer and more ductile. 



Experiment XII. — Eleventh Melting. 



Experiment XIIL — Eleventh Melting. 



The ultimate crushing force of the two last experiments, both from the 

 eleventh melting, are 



8Y, 

 89,( 



which may be taken as the force required to crush the eleventh melting. If 

 we compare the last three experiments with their respective tables, we shall 

 18.53. I 



),076 Ibsi} ^^*"' ^^'^^ ^^" 



