E. Lot 



-Results from c 



I of the 



to 1845. A large sheet of paper was ruled with 16 vertical 

 columns, and at the head of these columns were placed the letters 

 K ; N. N.E. ; N.E., etc., for the directions of the wind. I 

 first took the observations for the three winter months, and be- 

 ginning with Dec. 1, 1840, found that at the first observation 

 the wind was N.W. The temperature at this observation was 

 compared with the mean temperature of that month for the 

 same hour, and the difference (with its algebraic sign) was 

 placed in the column headed N.W. I proceeded in like man- 

 ner with each succeeding observation during the winter months 

 for the whole period of five years. The average of all the num- 

 bers in each column was taken and the results are shown in 

 column second of the following table. These numbers clearly 

 indicate that the coldest winds are from the neighborhood of 

 the N.W., and the warmest winds from the neighborhood of the 

 S.E. As, however, the progress of the numbers is somewhat 

 irregular, I have taken the average of each successive three 

 numbers in this column and placed the results in column third. 

 These numbers show a remarkable regularity, indicating a mini- 

 mum with a N.W. wind, and increasing thence uninterruptedly 

 to a maximum with a S.E. wind, and thence decreasing unin- 

 terruptedly to the minimum. The entire range of the numbers 

 in column third is 8-°46 Fahr., while the extreme range in 

 column second is 10-°18. 



Influence of winds 



on the temperature, moisture 



and pressure Of 



the atmosphere. 







Force of vapor at Philadelphia. 



Barometer at Philadelphia. 



Direction 







29 inches plus. 



^.. 



^^\^^}^}^t 



S"i Z'»^l\ S7 iTr'"! 



^^r;^,l5S:^:^ 



N. 



:i^fi-53|:3^s:3.3 



1"^ 



-005. --096! --085 



r039' r005^ •9^0^ -933 



N.N. E. 



_0-45l-0-25!-?-78 







+ •003 --0721 --072 



•986 1-0131 -9371 "956 





+ l-28:+O-40j~2-07 





+ •012 



+ ■005! -047—055 





r038 -980 -S'' 



E. N. E. 



+ 0-36! + 1-00 -2-68 







+ •011—046—040 





1-033 1-008 1-001 



E. 



+ l-37i+2-66-l-87 



-1-82 





+ •025—026—029 





1-018 roi4 1-018 





+ 6-26 +4-25 -0-90 







+ •043—016—004 





•953 r033 1-OU 





-h5-ll|+5-94;-0-66 



-0-24 





+ •060 + -031 +023 





■913 ^994 -918 



as.K 







+ 059 + -054 + -046 





•8 8^ -9061 -93^ 



s. 





+ •052 





•920 



•8891 -901 -91 



s. s. w. 



+ 3-05' ^:'.-8s't 2-72 T 2-48 



+ ■036 











+ 029 



+ •029;+ -066 +^056 



•890 



W.S.W. 







•874 



s q 3 



w. 







w^ 



-3-72-2-O3^4-0-8O,+0-lO|il039r-032:— 034 --034 





•9 l! •846 -m 





-l-26-2-52:-2-94:-l-79— 025--025:-081 -u67 





-968 -887! -88J 



N.N.W. 



-2-57-1-80I-3-22I-3-28— 012— 0151-086 --088 



•989 



1-006 -912 -Sl^ 



