brick cell or compartment erected within the heat- vey process, have carried still further forward the high ed by two springs, L ing chamber of a suitable furnace. The upper sur- standard of American ship armor. L, which press the face of the plate is then covered with powdered car- During the last… … the separation of the spring contacts is less than 0°2 millimeter heavy covering of fire bricks. The furnace is then ordnance-proving grounds of Europe. In 1890 trials per second; that is, lighted and then raised to a temperature sufficient to at Annapolis destroyed the prestige of Sheffield com-…
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