THE AIR 



161 



enough to save many lives and prevent the destruction 

 of much property. 



Each local Weather Bureau office receives from the 

 other offices the same reports that are sent to Washington. 

 From these reports the 

 local official predicts the 

 weather for his locality 

 and prints a daily 

 weather map. The pre- 

 dictions are printed in 

 the daily newspapers 

 and on cards and on the 

 maps sent out from the 

 Weather Bureau office. 

 By a careful study of 

 these reports and the 

 daily maps one can soon 

 learn to foretell the prob- 

 able weather conditions 

 of the folio wing day. The 

 many signals and lines 

 on a weather map are all 

 explained at the bottom 

 of each map. To under- 

 stand the map it is necessary to become familiar with the 

 signals and the meaning of the numbers and lines on it. 

 The words "low" and "high" refer to the reading of the 

 barometer. The word "low" is in a low pressure center 

 and the word "high" in a high pressure center. Cloudy 

 and unsettled weather follows a "low" center and fair 

 weather follows a " high " center. The winds blow toward 

 a "low" center and then rise, and they descend at a 

 "high" center and blow from it toward the "low" centers. 



PUBLIC WEATHER " CAB " 

 Showing the hygrometer, barometer, 

 rainfall gauge, thermograph, and maxi- 

 mum and minimum thermometers. 



