Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 410
t secret. Somemines are spherical in shape, about three feetin diameter, and constructed of steel. These,when in service, are expected to hold a hundredpounds of high explosives, and to float nearthe surface. But they must be concealed aswell as buoyant, and so to each is attachedby a cable a… … A MORTAR-BATTERY IN POSITION. ONE OF THE RIFLED MORTARS IS SHOWN ABOVE ON A LARGER SCALE. 397 398 HARBOR DEFENSES. [Mar.
Children's literature
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