Page:Popular Science Monthly Volume 3.djvu/279

Rh The method of dredging at a great distance is thus graphically described by Prof. Thomson, as it was performed in the Bay of Biscay, July 22, 1869. The depth was first accurately ascertained by sounding



and found to be 14,610 feet. "At 4.45 the dredge was let go, the vessel drifting slowly before a moderate breeze from the