Actions for U.S. Signal Service chart, showing the frequency of storm centres : number of storm centres passing over each point deduced from the average of two years, March 1871 to February 1873 inclusive
U.S. Signal Service chart, showing the frequency of storm centres : number of storm centres passing over each point deduced from the average of two years, March 1871 to February 1873 inclusive / compiled from data collected at the office of the Chief Signal Officer of the Army
United States Signal Service chart, showing the frequency of storm centres : number of storm centres passing over each point deduced from the average of two years, March 1871 to February 1873 inclusive
Published
[Washington, D.C.] : [United States Army Signal Corps?], [1874]
Scale approximately 1:10,400,000 (W 131°--W 65°/N 55°--N 20°).
Note
Relief shown by hachures. Data shown only for area east of 100th meridian. "This chart shows the frequency with which the centre of areas of low barometer (assumed to average fifty miles in diameter) have passed over any given district. It does not include local thunder or hail storms." "Pl. VI."
Reproduction Note
Also available online.
Complexity Note
Detached from: Statistical Atlas of the United States based on the results of the ninth census 1870. [New York]: Julius Bien, lith., 1874.