5U 



Professor W. Chandler Roberts- Austen [March 15, 



pletely when struck by the shot. It was not possible, on that 

 account, to make their faces as hard as those of compound plates ; 

 but while they did not resist the Palliser shot nearly as well as the 



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rival compound plate, they offered more effective resistance to steel 

 shot (see lower part of plate C, Fig. 7). 



It appears that Berthier recognised, in 1820, the great value of 



