NOTE.—Contains on reverse, Prevailing direction of wind on Great Lakes during September, with percentages, 1900-09.—Approximate location of submarine signal bell stations, Mar. 1911.—Distribution of radio [or] wireless telegraph stations on Great Lakes, and call letters for each.—Highest velocity of wind, direction, and date of occurrence during September, 1900-11.
The meteorological charts and supplements 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.