Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 449
of these engines of war, historyhas preserved for us several very interesting ex-amples. The Emperor Vespasian, during thesiege of Jerusalem, built a ram having a brasshead as large as ten men. It was armed with twenty-fivehorns, eachthe size of amans body,while theweight ofthe beamwas… … AND TOWER. 436 ANCIENT AND MODERN ARTILLERY. 437 of a body is measured by the product of itsweight and its velocity. Therefore if this ram,when worked against a wall of stone, was movedat the rate of two feet a second (a moderate es-timate), its force on striking the wall wouldbe 300,000 pounds,…
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