ith an initial “each such door or hatch must be capable of permitting ship of to-day. velocity of 2,900 feet per second and an initial energy The heaviest piece carried in the civil war was the operation on the spot by power or by hand from either 15-inch smooth bore. This gun weighed 42,000… … were an unending efficiencies of the two source of annoyance guns is the amount of aboard the ship. Hav- energy developed per ing ever in mind, how- ton of the weight of ever, the _ lessons the gun, and on this taught by the sinking basis we find that the of the British man-of- old 15-inch, %mooth-…
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