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Subma-rine′ Ex′ca-vator.

A device for removing earth or stone beneath the water surface. Fig. 6028 shows the caisson of the East River Bridge. For description, see the similar contrivance used in excavating for the piers of the St. Louis Bridge, page 49, and Plate H., opposite; also caisson, pages 420-422. See also dredging-machine, pages 747-749; and other devices cited in the list under hydraulic Engineering, pages 1146-1148.

Fig. 6029 shows an apparatus embodying a combination of conduits and mouth-pieces for excavating, dredging, and transmitting earthy and other loose matter, by means of forced currents of water, steam, or air, singly or combined. It is a form of dredge. The upper figures give details.

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