152 



EIGHTH REPORT — 1838. 



Table LIT. 

 Deduction of the Intensity at Tortington. 



i 



1. By comparison with Dublin. The observations at Dublin are by Professor 

 Lloyd; those at Tortington by Major Sabine. The intensity at Dublin 

 = 1'0195. The co-efRcient in the formula for the reduction to a mean 

 temperature of L (3) = -00027 ; of L (4) = -00022. 



Cyl. 



Time of 



100 



Vibrations, 



Corrected 

 Time. 



Dip. 



Intensity. 

 London 

 = I'OOOO. 



L (3), 



Tortington 

 Dublin 



Tortington 



1838 

 Feb. 9 



— 10 

 March 3 



— 3 



— 5 

 March 10 



— 10 



h m 



4 40 P.M. 



1 31 



1 37 



2 02 



3 03 



1 44 



2 38 



42 



36 



46-2 



47 



46-5 



46 



45-5 



295-67 1 

 295-09 ]■ 

 307-79 1 

 308-00 J. 

 307-35 J 

 296-74 1 

 296-53 / 



s. 

 297-05 



308-81 



297-75 



68 55-1 

 70 58-4 

 68 55-1 



0-99C3 



L(4). 



Tortington 

 Dublin 



Tortington 



Feb. 9 



— 10 

 March 3 



— 3 



— 5 

 March 10 



— 10 



5 09 p.m. 

 34 



2 46 



3 08 

 2 40 



10 43 a.m. 



41 



36 



46-8 



44-2 



47-2 



49 



46 



271-22 



270-78 

 282-58 

 282-58 

 282-57 

 272-53 

 271-98 



272-28 

 283-40 

 272-99 



68 55-1 



70 58-4 

 68 55-1 



0-9985 



2, By direct comparison with London. The London observations were made in 

 the Palace Gardens at Kew. 



Cyl. 



Time of 100 

 ■Vibrations. 



Dip. 



Intensity, 

 London 



= 1-0000 



L («). 

 L(6). 



("London 



L Tortington 



TLondon 



LTortin 



gton 



1838. 



Oct. 13 



— 13 

 Oct. 18 



— 18 

 Oct. 13 



— 13 

 Oct. 17 



— 18 



— 18 



h m 

 3 

 3 16 

 08 

 27 

 11 45 



15 



1 28 



10 17 



11 07 



39 

 40 

 52 

 53 



44 



44 



58-5 



48-0 



50-5 



I?' 



238-98 



237-77 

 237-81 



236-651 0Q7.i/> 

 236-80 1 '''*' ^^ 

 303-92 \ 

 304-06 ; 

 303-26] 

 302-18 y 303-20 

 302-46 J 



-305-21 



69 16-4 

 69 53-5 

 69 16-4 



68 53-5 



0-9986 



'0-99G5 



The values of the intensity at Tortington, relatively to unity in London thus de- 

 duced, are as follows : 



L (3), 0-9963 ; L (a), 0-9986 ; 



L (4), 0-9985 ; L (6), 0-9965 ; 



Mean, 0-9975. 



