190 



DISCUSSION OF THE ANNUAL FLUCTUATION 



Day of 



Month. 



Jan. 



Apr. 



May. 



June. 



July- 



Aug. 



Sept. 



Albany, New York. Lat. 42° 39'. Long. 73° 44' W. of G. 



Alt. 130 feet. 21 years of observation; including the years 1820 to 1829, inclusive. 

 MS. in Smithsonian Coll. 



25.4 



i8?4 



27 



2 



42 



6 



53.3 



64 



5 



73-3 



71 



6 



64°3 



55 7 



43-6 



35°8 



23-4 



22.7 



29 



5 



43 



1 



54.7 



6b 



6 



71.2 



71 



4 



67.2 



57 







43-3 



34 



2 



22.8 



23-4 



28 







43 



4 



57.0 



66 



6 



70.8 



73 



4 



65.2 



56 



3 



43-4 



32 



8 



19.8 



19.9 



29 



3 



43 



3 



55.9 



68 



6 



71-4 



71 



4 



66.7 



56 







44.0 



^i 



7 



22.1 



20.1 



33 



3 



43 



9 



55.1 



68 



8 



72.0 



71 



6 



65.0 



56 



3 



42.9 



31 







23.0 



22.7 



3' 



b 



45 



7 



57.4 



68 



7 



72.5 



72 



8 



64.9 



53 



8 



41. 1 



32 



3 



24-3 



24.4 



30 



6 



45 



9 



55-2 



70 







73-5 



74 



2 



62.2 



5^ 



8 



42.8 



34 



7 



23-3 



24.1 



32 



2 



45 



7 



55.f 



68 



6 



731 



73 







61.9 



53 



7 



42.4 



32 



9 



24-3 



23.6 



33 



9 



45 



7 



54.6 



67 



5 



72.0 



71 



3 



62.5 



55 



I 



42.0 



31 



4 



22.8 



27.2 



35 



I 



48 



6 



54.9 



66 



3 



72.3 



72 







62.6 



53 



6 



42.0 



29 



8 



21.4 



25-9 



35 



8 



4f 



6 



57-1 



68 



9 



70.6 



73 



2 



63.3 



51 







40.8 



30 



5 



24.8 



23-3 



3fa 



9 



47 



I 



59-4 



69 



5 



70-3 



72 



2 



61.2 



50 



5 



38.7 



28 



I 



24-3 



25.2 



33 



7 



46 



6 



.58.5 



69 



4 



69.4 



71 



3 



62.2 



52 



3 



37.6 



2q 



2 



23-7 



23.8 



31 



5 



49 



8 



59.8 



68 



2 



72.2 



71 



3 



61.9 



49 



6 



38.0 



30 



3 



23-7 



26.2 



34 







50 



4 



58.7 



70 







72.3 



6Q 



8 



61.3 



50 







36.0 



28 



9 



24.4 



28.2 



32 



3 



48 



7 



58.6 



70 



4 



72.3 



70 



I 



62.3 



49 



5 



3S.4 



28 



9 



24.9 



30.0 



32 



8 



48 



6 



62.3 



68 



8 



72.1 



71 



6 



60.5 



50 



6 



39-0 



25 



9 



24.7 



29.1 



33 



5 



49 



9 



63.7 



68 



8 



71.9 



68 



5 



60.0 



51 



5 



37-1 



27 



6 



25.6 



28. 5 



35 



3 



51 



9 



62.5 



69 



I 



73- 1 



68 



5 



60.7 



48 



5 



37-0 



28 







23.0 



30.1 



37 



4 



53 



5 



63. 8 



b7 



7 



71-3 



69 



7 



61.0 



47 



5 



36,6 



29 



9 



20.6 



307 



33 



5 



50 



9 



61.7 



bH 



3 



73.6 



68 



7 



60.2 



45 



7 



36.7 



28 



9 



22.8 



29. s 



35 



7 



5° 



5 



6i.7 



67 



9 



73-3 



69 



I 



57-3 



44 



6 



36.7 



26 







21.1 



27.9 



37 



5 



50 



7 



64.3 



68 



2 



72.6 



68 



9 



57-9 



48 



9 



37-0 



21 



7 



17.9 



26.3 



40 







47 



.5 



62.9 



69 







72.9 



69 



I 



57.6 



46 



6 



34-4 



28 



9 



21.3 



26.6 



3S 



5 



48 



9 



63.2 



69 



5 



72.4 



68 



5 



57-9 



46 



6 



35-7 



26 



7 



25.0 



30-4 



39 



I 



51 



8 



63.1 



70 



7 



71.6 



67 



6 



55-9 



45 



3 



34-8 



24 



2 



25.6 



28.1 



42 



4 



52 



7 



. 65.1 



73 



4 



72-3 



66 



6 



56.9 



45 



7 



34.1 



25 



9 



25.9 



27.4 



40 



9 



51 







67.0 



70 



4 



71.7 



66 



3 



55-3 



44 



7 



34-3 



27 



5 



22.6 



24.7 



40 



3 



53 



9 



64.2 



71 



3 



72,2 



67 



3 



54-9 



45 



3 



33-8 



27 



6 



21.0 





40 



4 



53 



5 



64.2 



73 



3 



73-1 



68 



9 



55-5 



44 



2 



34-3 



27 



7 



20. 8 





41 



8 







64-3 







73-6 



t>9 



6 





42 



6 





28 



3 



Observations at 3 P. M. for 2 years, at 9 P. M. for 10 years, and at 7 A. M., 2 and 9 P. M. for 9 years. Tabular 

 numbers corrected for daily fluctuation. 



In computing the original table, the observations at 3 P. M. were used for two of the years, those at 9 P. M. for ten, 

 and the daily means at 7 A. M., 2 and 9 P. M. for the remaining nine. When combined they afford a tolerable 

 ajsproximation to the true mean, as may be seen from the following statement, "which shows the correction for daily 

 fluctuation at 2 and 9 P. M. deduced from the observations often years of this series, from 1820 to 1829, inclusive, and 

 the reduction from 2 P. M. to 3 P. M. from the Mohawk table of daily fluctuation : — 



January 



February 



March 



April 



May 



June 



Corr'n 



Refer' ( 



3 P.M. 



Corr'n 



3 P.M. 



9 P.M. 



+0.7 

 +0.6 

 + 1.0 

 +2.2 

 + 1-7 

 + 1.8 



Corr'n 



7„,>2^,9^ 



-0-3 

 -0-3 

 -0.1 

 -0.1 



-°-3 

 -0.5 



July 



August 



September 



October 



November 



December 



Corr'n 



Refer'd 



Corr'n 



Corr'n 



at 



to 



at 



at 



2 P.M. 



3 P.M. 



3 P.M. 



9 P. M. 



t, 













—7-7 



—•3 



— S.o 



+ 1-9 



-8.3 



—.6 



-8.9 



+ 1-7 



—7-3 



—.6 



—7-9 



+ 1-4 



—6.8 



— 3 



—7-1 



+ 1.3 



—4-3 



— . I 



—4.4 



+0.9 



—3-8 



+ •■ 



—3-7 



+0.7 



Corr'n 

 to 



7m. 2^, 9a 



■ — 0.2 

 — 0.2 

 — 0,1 

 — 0-3 



The correction to mean of 7, 2, 9 is from the Mohawk table; now twice the correction 3 P. M. -f- ten times that at 

 9 P. M. -|-nine times that at 7, 2, 9, divided by 21, gives the following table of corrections : — 



January 



February 



March 



April 

 May 

 June 



+0.1 

 — 0.1 



July 



August 



September 



0.0 

 -0.1 

 -0.1 



October 



November 



December 



— 0.1 



0.0 



— 0.1 



These small corrections were applied, they answer to the middle of each month, and were interpolated for any 

 other day. 



