SIGNAL SERVICE. 



of lit/at mul cold, drought nnd precipitation. 

 The. i->iu from the Signal Office of the "Inter- 

 national Map of the Northern Hemisphere" has 

 widely . -MI -in led the viold of view. Professor 

 ^. I 'miV-sor Henry, and many other scien- 

 tist* li.-n I pointed out the necessity for extending 

 tin- si-opi- of the Signal Service observations 

 beyond the national territorial boundaries, if 



we are ever to learn the secrets of our na- 

 tional meteorology. The proposition of Gen- 

 eral Myer at Vienna, in 1873, having that end 

 in view, was that observations be taken daily 

 and simultaneously at as many stations as 

 practicable " throughout the WOBLD." A re- 

 cent meteorological conference at Hamburg 

 recommended a concert of all nations for 



MARQUETTE' 





MILWAUKEE! 



DUBUQUE , 



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O COLUMBUS 



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V \ CONCOROo \ 



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, NEWY(KO 



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/ PHILADELPHIA / 



-WASHINGTON 



FRANKFORTo 



AN ANTICTCI^NK, OB WAVB OF HIOH BAROMETRIC PRESKrRE FROM THE NORTHWEST. 



(Large arrow shows direction of its progress ; small arrows show Its winds.) 



planting a cordon of weather observatories in 

 nigh northern and southern latitudes around 

 the poles. Indeed, there is scarcely a prob- 

 lem relating to the physical geography und 

 meteorology of our own country which can 

 bo fully solved without recourse to more ex- 

 tended investigations outside of the United 

 States. The international weather service, we 

 may therefore say, is the great hope of the 

 meteorology of the future. 



In addition to the daily international chart* 

 published by the Chief Signal Officer, he has 

 begun the issue of monthly international charts 

 of the northern hemisphere, displaying the 

 monthly ocean-storm tracks, the average lines 

 of equal barometric pressure, the wind-zones, 

 isothermals, etc. These charts are published 

 in the "Monthly Weather Review," a journal 

 seat to all observers, on land and sea, who co- 



operate with the Signal Office in its interna- 

 tional research. To aid shipmasters of every 

 flag in keeping their instruments correct, the 

 Chief Signal Officer has al^o placed standard 

 barometers at the ports of New York, San 

 Francisco, and elsewhere, for reference and 

 comparison. Without pecuniary charge to for 

 eign or American ships, their barometers, on 

 application to the signal offices at these ports, 

 are carefully tested, adjusted, and corrected for 

 effective use at sea. 



With the extension and collation of the in- 

 ternational weather-reports, we may hope, as 

 General Myer lias said, that " the questions as 

 to the translations of storms from continent to 

 continent, and of the times and directions they 

 may take in such movements ; the movement 

 of areas of high and low barometer ; the con- 

 ditions of temperature, pressure, etc., existing 



