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HOW SUBMARINE PERILS TO NAVIGATION ARE DISCOVERED IN ALASKAN WATERS Reefs and pinnacle rocks are responsible for a long list of shipwrecks in the innumerable bays and channels of the Alaskan archipelago. Until recently the only ones definitely known to exist were generally named for vessels which had come to grief upon them. Illus- tration No. 5 shows how the federal coast and geodetic survey is charting these waters by means of a wire drag. No. 6 depicts a 64-foot steel passenger and cargo power boat recently completed by the Welin Marine Equipment Co., Long Island City, N. Y., for use in South American waters. Driven by a 65-75-horsepower Standard engine, she made more than 12 miles an hour on her trial trip. A car ferry owned by the Pere Marquette railroad, stranded in the ice off Ludington, Mich., is shown in Nos. 7 and 8. In No. 9 is seen Bessiz, a sturdy water-carrier of Baltimore harbor, powered with a 35-55-horsepower Sterling engine; while No. 10 depicts Jacosp Jones, one of Uncle Sam’s crack new destroyers, which was recently built by the New York Ship Building Co., Camden, N. J. 129