Pressure of the Wind. 



287 



TABLE XXIV.— Daily, Weekly, and Monthly Means of the Pressure of Wind in Pounds on the 

 Square Foot of Surface, deduced from the greatest Pressures observed within lO'" at the hours 

 of Observation. 



Civil 

 Day. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





Vo. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



Ih. 



lb. 



1 



[ 1 



2-30 



0-22 



0-39 



0-22 



0-25 



106 



0-47 



0-00 



[0-37] 



000 



0-00 



2 



010 



2-50 



0-28 



[0-58] 



018 



0-33 



[0-73] 



0-43 



012 



0-73 



0-00 



0-28 



3 



0-20 



2-08 



007 



0-35 



006 



0-52 



2-31 



0-20 



[0-10] 



0-12 



000 



[0-89] 



4 



1-07 



4-54 



0-08 



0-27 



0-25 



[0-34] 



0-26 



001 



0-41 



0-47 



0-77 



0-51 



5 



0-87 



[1-75] 



[0-11] 



0-42 



1-51 



0-55 



010 



0-56 



004 



0-17 



[0-46] 



2-79 



6 



0-52 



0-84 



0-03 



0-35 



014 



0-10 



0-42 



[0-17] 



0-02 



0-94 



0-67 



1-55 



■ 7 



1-32 



0-54 



0-18 



0-21 



[0-52] 



0-27 



0-08 



015 



0-07 



0-60 



0-82 



1-66 



8 



[1-19] 



002 



000 



0-40 



0-55 



1-71 



0-02 



007 



0-01 



[0-32] 



0-50 



0-68 



9 



116 



1-39 



012 



[0-52] 



0-46 



0-91 



[0-19] 



0-01 



003 



003 



0-12 



002 



10 



2-88 



0-71 



0-00 



0-39 



0-22 



0-93 



0-22 



002 



[0-05] 



000 



0-00 



[0-60] 



11 ; 



0-38 



0-44 



Oil 



0-56 



015 



[0-73] 



014 



007 



0-05 



0-16 



005 



015 



12 



0-00 



[0-57] 



[0-19] 



1-22 



004 



0-21 



0-28 



0-07 



0-07 



2-02 



[0-14] 



012 



13 



1-29 



007 



0-72 



0-47 



0-47 



0-27 



0-07 



[0-07] 



007 



0-36 



006 



0-98 



14 



2-47 



0-80 



012 



1-86 



[0-48] 



0-36 



0-23 



012 



007 



015 



01 3 



214 



15 



[1-00] 



000 



0-05 



0-62 



0-42 



0-22 



0-67 



012 



0-21 



[0-55] 



0-47 



1-90 



16 



0-57 



002 



015 



[0-60] 



0-93 



0-23 



[0-31] 



0-02 



0-34 



004 



002 



0-12 



17 i 



0-85 



0-19 



0-79 



000 



0-86 



018 



0-13 



000 



[0-22] 



0-66 



1-58 



[0-72] 



18 i 



0-81 



000 



0-12 



0-51 



0-24 



[0-26] 



0-57 



0-01 



0-45 



008 



0-41 



0-02 



19 



0-58 



[0-44] 



[0-29] 



013 



0-37 



0-33 



0-21 



002 



001 



0-07 



[0-76] 



002 



20 



002 



1-42 



012 



007 



0-93 



002 



0-31 



[0-20] 



0-27 



0-38 



0-40 



0-14 



21 



002 



0-66 



0-20 



0-10 



[0-48] 



0-60 



0-33 



0-27 



0-18 



017 



0-73 



0-01 



22 



[0-66] 



0-35 



0-34 



007 



0-42 



0-06 



0-07 



0-52 



000 



[0-44] 



1-40 



1-98 



23 i 



0-73 



0-80 



0-25 



[0-53] 



0-18 



0-18 



[0-21] 



0-40 



0-00 



1-17 



002 



1-24 



24 : 



113 



002 



0-46 



0-83 



0-77 



012 



0-06 



004 



[0-18] 



0-54 



000 



[0-69] 



25 i 



1-47 



000 



0-86 



1-92 



0-22 



[0-32] 



003 



0-28 



0-28 



0-32 



0-00 



0-34 



26 



0-87 



[0-37] 



[0-49] 



0-21 



0-47 



017 



0-46 



Oil 



019 



0-12 



[0-71] 



0-41 



27 i 



2-48 



0-97 



M6 



0-42 



0-07 



0-52 



0-55 



[0-19] 



0-46 



0-16 



1-57 



017 



28 i 



4-77 



0-22 



0-23 



0-42 



[0-21] 



0-86 



007 



0-51 



0-52 



1-36 



0-90 



0-34 



29 ! 



[2-91] 





000 



0-13 



0-23 



013 



0-27 



0-18 



013 



[0-29] 



1-75 



0-22 



30 



5-00 





010 



[0-24] 



003 



0-50 



[0-31] 



000 



0-24 



005 



0-19 



0-93 



31 



207 





1-93 





0-25 





009 



003 





005 





[0-29] 



Mean 



1-29 



0-87 



0-32 



0-49 



0-39 



0-40 



0-35 



0-17 



0-16 



0-42 



0-48 



0-72 



The means in this Table have been obtained from the nine observations by the formula already given, 

 Table I., for the temperature of the air. The daily means in the first week of January are the means of the 

 four daily observations. 



Annual Variation of the Means of the Maximum Pressures of Wind at the Hours of Observation. — Naming 

 these pressures the mean pressures, for which they may be taken approximately, we find the same law of varia- 

 tion as for the maximum pressures. The mean pressure is greatest for January, the mean being 1-29 lb. ; it 

 diminishes till March, in which there is a minimum, the means for the four months following being greater ; 

 the least pressures occur in August and September, the mean for the latter being 0-16 lb. ; the pressure then 

 increases till December. The following are the means for the three groups of seasons : — 



Seasons. Mean 



Meteorological. 



Meteorological for 1843. 



Astronomical 





lb. 



lb. 



lb. 



Spring, 



0-40 



0-43 



0-56 



Summer, 



0-31 



0-23 



0-38 



Autumn, 



0-35 



0-54 



0-25 



Winter, 



0-96 



0-83 



0.83 



Range of Means, 



0-65 



0-60 



0-58 



