Your ShelfYour Projects

Electric Hardening of Armor Plate

50%

Review and Herald Publishing Association · Takoma Park Station, Washington, D. C. · Jan 30, 1908

FromReview and Herald, Vol. 85, No. 5.

Read the full edition

Electric Hardening of Armor Plate

— Lieutenant Cleland Davis, U. S. N., has invented a method of face-hardening armor plate by electricity, which bids fair to supersede the present Krupp or Harvey method.