Bigelow — Meteorological Elements of the United States. 421 



Table VI. — Annual Variations of the Barometric Pressure. 









Pacific 





Eocky Slope 





C entral-Eastern 



Year 























B 



M 



B-M 



B 



M 



B-M 



B 



M 



B-M 



1873 









+ •005 



+ •012 



-•007 



-•010 



+ •010 



-•020 



74 













+ •011 



+ •010 



+ •001 



+ 



038 



+ •006 



+ •032 



75 











+ •006 



+ •006 



000 



+ 



004 



+ •006 



-•002 



76 













+ •008 



-004 



+ •012 



— 



003 



-•003 



000 



77 









000 



-•006 



+ •006 



+ 



003 



-•007 



+ .010 



78 



— 



027 



- : 006 



-•021 



—•043 



-•007 



-•035 



— 



055 



-•006 



— 



049 



79 



+ 



001 



-•004 



+ •005 



-•004 



-•012 



+ •009 



+ 



015 



-•006 



+ 



021 



1880 



+ 



022 



-■001 



+ •023 



-•006 



-•014 



+ •008 



+ 



013 



-•004 



+ 



016 



81 



— 



003 



+ •007 



-•010 



-•013 



-•001 



-•012 



— 



006 



+ •011 



— 



018 



82 



+ 



004 



+ '001 



+ •003 



-•002 



-•001 



-•001 



+ 



013 



+ •008 



+ 



005 



83 



+ 



014 



-•007 



+ -021 



+ •017 



000 



+ ■018 



+ 



020 



-•001 



+ 



021 



84 



— 



032 



-•008 



-•024 



-•002 



+ •002 



-•005 



— 



004 



-•001 



— 



002 



85 



— 



020 



-•009 



-•on 



000 



+ ■002 



-•002 



— 



028 



-•004 



_ 



024 



86 



— 



006 



-•015 



+ •009 



-•001 



000 



--001 



— 



006 



-•006 



— 



001 



87 



— 



002 



-•012 



+ •010 



-•004 



+ •002 



-•006 



— 



001 



-•006 



+ 



004 



88 



— 



018 



-•004 



-•014 



+ •005 



+ •005 



000 



+ 



012 



+ •002 



+ 



010 



89 



— 



Oil 



—•002 



-•009 



+ •012 



+ •005 



+ •007 



— 



003 



+ •006 



— 



009 



1890 



+ 



016 



000 



+ •016 



+ •015 



+ •008 



+ •007 



+ 



Oil 



+ •007 



+ 



004 



91 



+ 



004 



+ •006 



-•002 



000 



+ •004 



-•004 



+ 



010 



000 



+ 



010 



92 



+ 



007 



+ •010 



-•003 



+ •008 



+ •004 



+ •003 



+ 



007 



000 



+ 



006 



93 



+ 



012 



+ •009 



+ •003 



-013 



+ -003 



-•017 



— 



025 



-•003 



— 



023 



94 



+ 



014 



+ •008 



+ •006 



+ •013 



+ •005 



+ •008 



+ 



004 



-•003 



+ 



006 



95 



+ 



008 



+ •008 



000 



+ •008 



+ •004 



+ •004 



— 



008 



-•003 



— 



005 



96 



— 



002 



+ •005 



-•007 



+ •011 



+ •007 



+ •004 



+ 



009 



+ •001 



+ 



008 



97 



+ 



007 



+ •002 



+ •005 



+ •004 



+ •004 



000 



+ 



004 



000 



+ 



004 



98 



+ 



001 



000 



+ •001 



-•003 



+ •002 



-•005 



— 



007 



+ •001 



— 



008 



99 



— 



002 



+ •001 



-•003 



-•001 



000 



-•001 



+ 



002 



-•007 



+ 



009 



1900 



— 



006 



-•004 



-•002 



-•001 



-■004 



+ •003 



■— 



006 



-•013 



+ 



007 



01 



+ 



006 



-•002 



+ •008 



+ •002 



000 



+ •002 



— 



028 



-•012 



— 



016 



02 



— 



018 



-•001 



-•017 



-•017 



+ •004 



-•022 



— 



028 



-■012 



— 



016 



03 



+ 



012 



-•002 



+ •014 



+ •016 



+ ■007 



+ •008 



_ 



002 



-•008 



+ 



006 



04 



+ 



002 



-•006 



+ •008 



+ •019 



+ •005 



+ •014 



+ 



012 



-•005 



+ 



017 



05 



-•013 



-•004 



-•009 



+ -01.5 



+ -009 



+ ■006 



+ •004 



+ •008 



-•004 



1877. Finally the third column in the summaries, P-M, H-M, 

 T-M, V-M, B-M were made by subtraction, and this gives 

 the short period, which is required to be superposed upon the 

 long period to produce the original curve representing the 

 observed annual values of the several elements. 



These data of the long and short periods are transferred to 

 fig. 1 for the Pacific States, to fig. 2 for the Plateau and 

 West Gulf States, and to fig. 3 for the Central and Eastern 

 States, and their mutual relations can there be readily studied. 

 The arguments are marked in every case, and need not be fur- 

 ther explained. 



