Scientific j|wmcm 8 [July 4, 1896. BALLISTIC TEST OF KE- … armor plate. The combina- PLATE IN POSITION FOR TEST. tion of the qualities of tough- ness and hardness is obtained as the result of special chemi- cal composition, work, super- carbonization, reforging, and water hardening. The final operation is the actual face hardening (frequently called…
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