NOTE.—Contains, on reverse, Highest velocity of wind, 1900-10.—Total amount of snow in inches, unmelted, Dec. 1900-10.—Average depth of snow on ground and average thickness of ice in harbors, etc., in inches, Dec. 1900-10.—Approximate location of submarine signal bell stations, Mar. 1911.—Distribution of wireless telegraph stations on Great Lakes, and call letters for each.—Dates on which navigation closed at ports on Great Lakes during last 5 years.
The meteorological charts of the north Atlantic, north Pacific, and Indian oceans, and the Great Lakes, monthly, and of the south Atlantic and south Pacific oceans, quarterly, are issued by the Weather Bureau for gratuitous distribution to cooperating shipmasters and others interested in ocean meteorology.