332 



niiPOiiT — 1887. 



Appendix IV. Note hij Professor Stewart and W. L. Carpenter, Esq. 



We have now reduced all the available Kew declination distni'bances 

 after the manner described in the first report of this Committee, with the 

 view of ascertaining whether there is any apparent connexion between 

 disttirbances and the moon's age. The following are the results ob- 

 tained : — 



Siij}j}OSed conne.rioH hetween dhturhances and the Moon's age. 

 (0) = nen; (4) = full Moon. 



1858-61 . 

 1862-65. 

 1 866-69 . 

 1870-73. 



Mean of 16 years 



(0) (1) r2) i (.9) 



72 



83 



88 



111 



88 



76 

 80 



;ii 



114 



84 



78 



104 



81 

 '.17 

 64 



85 



84 



From this table it will be seen that while the first two terms of the 

 series exhibit predominant maxima a little after full moon, the last two 

 exhibit predominant maxima a little after new moon. The mean of the 

 whole indicates two maxima, one a little after new and another a little 

 after full moon. This subject will engage our further attention. 



We have likewise reduced these same disturbances after the manner 

 desci'ibed in the second report of this Committee, with the view of deter- 

 mining whether there is any apparent connexion between wind values 

 and magnetic disturbances, and have obtained the following results : — 



(a) Wind weather arranged so that mass, values represent middle of series 



1858-61 -2.794 -1,958 



1862-G5 -3,7-18 -2,263 



1866-(;9 -4,296 -3,621 



1870-73 -2,384 -1,665 



-20 +2,402 +4.589 +6,272 +6,31U +5.148 +2,812 +336 -I..0-17 -2,999 



+ 437 +3,108 +3,205 +5,794 +6,1137 +5,240 +2,939 +143 -1.718 -2,660 



-435 +3,325 +7,303 +8,248 +7,729 +5,699 +2.218 -508 -3.023 -4,060 



-101 +2.205 +5,935 +7.431 +7,022 +4,157 +1.501 -360 -1,667 -2,196 



Total 



jjgg^ggj^jg}- -13,222 -9,497 -119+11,340+23,032+27,745+27,098+20,244 +9,470 -389-7,955-11,915 



(;8) Dec. disturbance values .so arranged that each entry of (;8) is two days previous to 

 eacli entry of (o) : 



1858-61 -1.129 -1.715 -1,571 



1862-65 -10 -183 +29 



1866-69 -1,657 -806 -302 



1870-73 -2,220 -652 +245 



Total ) ' 

 aggregate / 



-1.240 

 + 550 

 +447 



+ 1.110 



+ 453 +1,521 +1.945 +1.509 +1.287 +1,001 +590 -452 



+ 983 +1,519 +1,318 +402 -144 -291 -152 +141 



+ 885 +2,053 +1,907 +1,5.50 -470 -726 -1.152 -886 



+ 919 +693 +1,007 +466 +1.067 +588 +33 -186 



-5,016 -3,356 -1,599 +867 +3,240 +5,786 +6,177 +3,927 +1,740 +572 



(7) Wind weather arranged so that min. values represent middle of series : 



-681 



-1,3,S3 



1858-61 

 1862-65 

 1866-69 

 1870-73 



+ 3,463 +1.031 



+ 3,759 +1,681 



+ 4.672 +1.951 -822 



+ 2.535 +1.114 -1,017 



2,206 

 1,124 



-3,786 

 -3.434 

 -3.631 

 -3,.393 



-4,703 

 -4,649 

 -5,471 

 -4,872 



-4.916 

 -5.045 

 -6,148 

 -5.312 



-4,837 

 -5,539 

 -5,959 

 -5,177 



-4,207 

 -5.023 

 -5.025 



-2.915 -719 +038 +2.012 

 -3,218 -680 +1.858 +3,486 

 -3,682 -682 +2,337 +4.615 



-4,740 -3.322-1,680+1,074 +3,196 



gj:ggj^jg I +14,419 +5,777 -5,169 -14,244 -19,695 -21,421 -21,512 -18,995 -13,137 -3,761 +5,907 +1.3,.309 



(5) Dec. disturbance values so arranged that each entiy of (S) is two days previous to 

 each entry of (7) : 



1858-61 +2,023 +2.374 +1,021 



1862-65 +528 -254 -661 



1866-69 +1,355 +1,321 -365 



1870-73 +679 +177 -474 



Total ) 

 aggregate J 



+ 4,585 +3,618 -469 -2,536 -3,224 



2,624 -2,024 -2,189 -1,523 -20 



From these tables it would appear that high and low disturbance 

 values correspond with and slightly precede high and low wind values. 



