ne of the stanohest Arctic vessels The breech block, it will be seen, is different from old ship with the torpedoes used at that time, which, I that shown in the Dashiell mechanism (Scientific ever built. She was specially constructed for ice work believe, carried about sixty pounds of guncotton.… … of three thick- Fig. 4,-SIGHTING A 6-INCH RAPID-FIRE GUN BREECH CLOSED, only two motions nesses of oak, 3 feet thick amid- of the breech block instead of three. At the end of its travel, the and thicker at the bow and stern. The ram completely to pieces by the explosion, the keel and bot- ships…
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