Pressure of the Wind. 



285 



TABLE XXII. — Extremes of the Mean Daily Pressures of Dry Air, with their Ranges and Means. 



Month. 



Highest. 



Lowest. 



Range. 



Mean. 



Monthly Mean 

 minus Mean. 





d. 



in. 



d. 



in. 



in. 



in. 



in. 



January 



19 



29-875 



13 



27-820 



2-055 



28-847 



+ 0-297 



February 



11 



29-830 



3 



28-748 



1-082 



29-289 



+ 0-030 



March 



8 



29-962 



31 



28-764 



1-198 



29-364 



+ 0079 



April 



11 



29612 



1 



28-704 



0-908 



29-158 



+ 0-079 



May 



1 



29-920 



27 



28-813 



1-107 



29-366 



-0-027 



June 



12 



29-687 



9 



28-504 



1-183 



29-095 



+ 0-205 



July 



11 



29-648 



29 



28-838 



0-810 



29-243 



+ 0-005 



August 



30 



29-611 



3 



28-716 



0-895 



29-163 



+ 0-082 



September 



23 



29-943 



30 



29082 



0-861 



29-512 



+ 0-042 



October 



19 



29-928 



28 



28-322 



1-606 



29-125 



+ 0-031 



November 



14 



29-883 



22 



28-724 



1-159 



29-303 



-0-067 



December 



i 



18 



29-902 



5 



29-277 



0-625 



29-589 



+ 0-096 



This Table has been formed from Table XX. 



The highest mean daily pressure of dry air occurred March 8'^ = 29*962 

 The lowest Jan. 13<J = 27-820 



i Range = 2" 



142, Mean = 28-891. 



This mean is 0*433 in. less than the mean for the year. 



The mean of the 12 monthly maxima and minima of the daily means is 0-071 in. less than the mean for 

 the year. 



in. 



The greatest monthly range of the daily means occurred January 13 — 19 = 2-055. 

 The least December =0-625. 



The ranges and means give nearly the same results as have been obtained for the total atmospheric pressure. 



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

 Square Foot of Surface, deduced from the greatest Pressures occurring between the Two Hourly 

 Observations. 



CivU 

 Day. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



lb. 



1 



[ ] 



4-24 



0-52 



1-04 



0-30 



0-40 



1-56 



1-20 



0-11 



[0-69] 



0-02 



0-07 



2 



0-50 



3-96 



0-54 



[0-81] 



0-28 



0-50 



[1-14] 



0-92 



0-28 



1-27 



001 



0-47 



3 



0-50 



3-42 



0-23 



0-62 



0-17 



1-18 



3-20 



0-42 



[0-22] 



0-34 



0-06 



[1-72] 



4 



2-20 



5-97 



0-18 



0-52 



0-35 



[0-64] 



0-59 



0-03 



0-64 



0-67 



1-31 



1-32 



5 



2-00 



[2-67] 



[0-23] 



0-73 



2-47 



1-04 



0-26 



1-35 



015 



0-37 



[1-08] 



3-96 



6 



1-00 



1-29 



0-15 



0-64 



0-67 



0-31 



0-99 



[0-44] 



0-12 



1-48 



1-80 



3-90 



7 



3-50 



0-98 



0-27 



0-74 



[0-92] 



0-39 



0-22 



0-39 



016 



1-35 



1-66 



2-96 



8 



[2-18] 



0-42 



000 



0-85 



0-72 



2-57 



0-14 



0-42 



0-02 



[0-57] 



1-67 



1-48 



9 



206 



2-10 



0-19 



[1-05] 



0-89 



1-70 



[0-46] 



0-02 



012 



Oil 



0-40 



0-10 



10 



3-52 



1-80 



0-05 



0-90 



0-45 



1-62 



0-42 



0-06 



[0-12] 



001 



0-06 



[1-27] 



11 



0-99 



0-74 



0-20 



1-22 



0-25 



[1-27] 



0-35 



0-19 



0-12 



0-09 



0-22 



0-41 



12 



0-00 



[1-06] 



[0-41] 



1-94 



013 



0-43 



0-62 



0-26 



0-12 



3-42 



[0-37] 



0-35 



13 



1-88 



0-17 



1-37 



1-27 



0-99 



0-57 



« 0-23 



[0-18] 



0-16 



1-40 



0-15 



2-31 



14 



2-72 



1-43 



0-35 



2-41 



[0-88] 



0-71 



0-47 



0-28 



0-14 



0-41 



0-32 



3-18 



15 



[1-45] 



0-12 



0-31 



1-02 



0-78 



0-47 



1-22 



0-25 



0-32 



[1-19] 



1-09 



3-23 



16 



1-22 



005 



0-47 



[1-02] 



1-57 



0-32 



[0-58] 



0-07 



0-57 



0-12 



0-25 



040 



MAG. AND MET. OBS. 1843. 



4c 



