st of these spans resting upon the fixed pier of transmitted along these lines in a forged tube of the the gun, and therefore, particular value attaches to the central swing-span. The latter is 310 feet in length same thickness, when fired with powder developing the fact that the results of the… … few years ago. An en- the lining tube, and each deavor has been made to piece is bent in special secure gracefulness of out- rollers to the involute
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