286 



Abstracts of the Makerstoun Observations, 1843. 



TABLE XXllL— Continued. 



Civil 

 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. 



17 



1-35 



0-27 



1-72 



002 



1-56 



0-28 



0-33 



005 



[0-44] 



1-40 



1-77 



[1-25] 



18 



1-52 



004 



0-51 



0-89 



0-61 



[0-43] 



0-87 



003 



1-02 



0-37 



1-77 



008 



19 



0-99 



[0-68] 



[0-69] 



0-52 



0-62 



0-56 



0-37 



008 



004 



010 



[1-52] 



0-17 



20 



0-31 



2-10 



0-32 



0-18 



1-29 



0-10 



0-66 



[0-42] 



0-55 



0-71 



113 



0-46 



21 



0-10 



106 



0-60 



0-21 



[0-66] 



0-84 



0-65 



0-61 



0-52 



0-57 



0-89 



007 



22 



[1-14] 



0-57 



0-54 



Oil 



0-62 



0-10 



012 



0-91 



002 



[1-01] 



3-32 



307 



23 



1-68 



104 



0-64 



[0-78] 



0-45 



0-35 



[0-39] 



0-86 



005 



2-48 



013 



2-65 



24 



1-83 



0-27 



0-67 



1-25 



0-38 



019 



012 



0-09 



[0-29] 



1-78 



000 



[1-303 



25 



1-92 



002 



1-22 



2-37 



0-56 



[0-59] 



000 



0-63 



0-56 



0-45 



000 



0-74 



26 



142 



[0-71] 



[0-81] 



0-54 



0-97 



0-35 



0-80 



0-28 



0-41 



0-26 



[1-23] 



0-90 



27 



3-39 



1-44 



1-69 



0-72 



0-37 



0-88 



1-19 



[0-42] 



019 



0-39 



2-90 



0-38 



28 



5-47 



0-95 



0-60 



0-90 



[0-50] 



1-69 



0-22 



0-95 



0-97 



203 



1-52 



0-57 



29 



[4-16] 





0-06 



0-27 



0-57 



0-39 



0-62 



0-51 



0-28 



[0-49] 



2-82 



0-98 



30 



6-60 





0-18 



[0-44] 



017 



0-87 



[0-73] 



0-04 



0-63 



010 



0-61 



2-26 



31 



3-84 





1-80 





0-38 





0-24 



0-03 





0-14 



100 



[0-80] 

 1-40 



Mean 



202 



1-44 



0-57 



0-88 



0-69 



0-72 



0-63 



0-40 



0-32 



0-84 



The means in this Table have been obtained from the daily observations by the following formula : — The 

 observation at 18'' being that of the maximum pressure of wind which has occurred from 10*' of the previous 

 evening (excepting Monday mornings, when it is the maximum pressure which has occurred from about noon 

 of the previous day), the observation at 18*^ may be used as the maximum pressure belonging to some one 

 couple of hours in tlie previous morning (excepting on Mondays). M being the daily means of the maxima in 

 the previous Table, S the sum of the nine daily observations, 10^ the maximum observed at the 10'' preceding 

 the l&" observation, 10^ the maximum observed at the 10'' succeeding the 18'' observation, then 



^ _ S + lOp + 20 + 10, 

 12 



For Mondays the means have been obtained by the formula 



S' + 3 X 20 + 10, 



M = 



12 



where S' is the sum of the eight observations from 20'' till 10'' ; the observation at 18'' obviously could not be 

 used for the daily means on Mondays. 



The means of the four daily observations were taken for the daily means in the first week of January. 



Annual Variation of the Means of the Maximum Pressures of the Wind. — The greatest monthly mean is 

 that for January, being 2-02 lb., and the least is that for September, being 0-32 lb. The pressure iminishes 

 from January till March, when there is a minimum, the means for the four months following being greater ; it 

 increases from September to December. The following are the means for the three gToups of seasons, namely. 



The mean meteorological seasons, for which June, July, and August constitute summer. 



The meteoi'ological seasons for 1843, for which July, August, and September constitute summer. 



The astronomical seasons, for which May, June, and July constitute summer. 



Seasons. 



Mean Meteorological. 



Meteorological for 1843. 



Astronomical 





lb. 



lb. 



lb. 



Spring, 



0-71 



0-76 



0-96 



Summer, 



0-58 



0-45 



0-68 



Autumn, 



0-72 



108 



0-52 



Winter, 



1-62 



1-34 



1-47 



Range of Means, 



104 



0-89 



0-95 



The pressure is greatest in the coldest quarter and least in the warmest quarter of 1843. 

 The mean for the year of the maximum pressures = 0'91 lb. 



