526 



Transactions. 



to the bottom of its swing, where it encounters a notched speci- 

 men, the work done breaking which is readily obtained, as the 

 angular distance by which the pendulum fails to rise to the 

 height which it attains when swinging freely is recorded by a 

 pointer. 



The following tables are extracted from results published 

 by Messrs. Seaton and Jucle and Captain Sankey. (The ex- 

 periments at Canterbury College are not yet complete. They 

 will appear as a supplement to this paper). 



*" Impact Tests on the Wrought Steels of Commerce" (Proceedings Mech. 

 Engrs., 1904). 



Sankey (Table I). 



Description. 



Treatment. 



Maximum Yield- 

 Load, j point. 



Elongation 

 on 2 in. 



Reduction 

 Area. 



Studs teel \ 

 [ 



! As received 

 Annealed . . 



34-7 



28-1 



21-6 21-5 



21-4 



36-5 



Per Cent. 

 52 



58 



Impact. 



Ft.-lb. 

 1-3 

 (very .short). 



21-2 

 (very tough). 



Sankey (Table II). 



