182 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE. 



pressure for twenty years, of temperature for twenty-one years, of 

 wind roses (force and direction) for twenty-five years, and of the 

 percentage of gales and calms and trade-wind limits, all deduced from 

 a large number of observations for each 5° square of latitude and 

 longitude. These charts will be revised each year and additional 

 storm tracks entered thereon. 



Work on the monthly charts of the Indian Ocean is under way. 

 Beginning with the month of January, pilot and meteorological 

 charts will be published containing data similar to that on the North 

 Atlantic charts, including the paths of the more severe storms and 

 the limits of fog. 



The compilation of data for a meteorological chart of the Great 

 Lakes is well in hand. With January, 1911, a monthly meteorological 

 chart will be published containing all the meteorological features and 

 the tracks of the more severe storms that have passed over that region 

 each month for the last ten years. 



In connection with the storm tracks traversing the North Pacific 

 Ocean, I desire to invite attention to the kind cooperation of the 

 Zikawei Observatory, in charge of Professor Froc, in furnishing the 

 results of the compiled data and study of Pere H. Gauthier in por- 

 traying the approximate tracks of storms in the middle and higher 

 latitudes of the North Pacific Ocean. The Hongkong Observatory 

 has also given us valued material, while the India Observatory at 

 Simla, India, the Australian meteorological service, the Weather 

 Bureau of the Philippine Islands, and the meteorological service of 

 Canada have kindly furnished all available data. Publications of 

 the other meteorological services have been used for study and 

 reference. 



WIRELESS TELEGRAPH SERVICE. 



On account of the falling off in the number of vessels leaving 

 San Francisco, very few wireless observations were received there 

 during the year. The service to Portland, Oreg., has been continued 

 throughout the year. From 20 to 75 reports are received each month 

 at that station," but the official in charge states that only about 26 

 per cent are of benefit in his forecast work, the barometer readings 

 and wind and weather being of most value. More than half of the 

 reports are received too late for use. These messages are sent and 

 received without expense to the Bureau, through the courtesy of the 

 vessel captains, the United Wireless Company, and the naval wire- 

 less stations. Many of the reports are received at Katalla or Cor- 

 dova, Alaska, and forwarded hj cable free of cost. 



VESSEL REPORTING STATIONS. 



In addition to their meteorological work the stations at Block 

 Island, Cape Henry, Jupiter, Sand Key, Southeast Farallon, North 

 Head, Point Eeyes, Port Crescent, and Tatoosh Island are required 

 to report all passing vessels, wrecks, and marine disasters and 

 casualties, and to transmit all communications between masters, 

 owners, underwriters, and others interested. The stations at Cape 

 Henry, Jupiter, Sand Key, Southeast Farallon, Point Eeyes, North 

 Head, and Tatoosh Island are equipped for signaling by the inter- 

 national code, and are prepared to transmit messages by telegraph. 



