246 



THE REV. W. WHEWELL ON THE DETERMINATION OF THE 



The parallax corrections of time are as follows (for 60'), in minutes and decimals : 



mm h 



London .... — 4*6 — 8*8 



Liverpool . . . 



Plymouth . . . 



Bristol, 1834, 

 1835, 

 1836, 

 1837, 



*, 2<p— 14 

 *, 2 ^ - 13 

 s,2<p—l4 

 s,2<p - 14 

 s,2(p - 14 

 *, 2 (p — 13 

 *, 2 9 - 13. 



*, 2 ^ — 18 

 *, 2 9 — 18 

 *, 2 9 — 14 

 *, 2 ^ — 15 

 ;?, 2 ^ — 16 

 Sj2p - 14 



2-6- 7-3 



7-2- 91 

 107 - 12-3 



8-5 - 10-5 



6—9- 

 11 —12- 



The parallax corrections of height are as follows, in decimals of feet (for 60') : 



h 



London 75 + '23 



Liverpool. . . 1*35 + -09 

 Plymouth... -57 + '09 

 Bristol, 1834, 2*35 + -65 



1835,2-1 +-60 



1836, 1-85 + -65 



1837,2-1 +-50 .*, 2^— 131 



The constant part, which is here much the most considerable, is nearly in the pro- 

 portion of the mean tide. 



The declination corrections of time are (for 7°), 



mm h 



Plymouth ... 35 — 6-5 . *, 2 (p — 12^ ; 

 Bristol, 1834, - 05 - 5-5 . *, 2 p — 12^ ; 



1835, 1-5 - 7-5 .*, 2<p— 13J; 



1836, 1-5 — 7-5 . 5, 2 <p — 13| ; 



1837, 3-3 — 7'7'S,2<p-' 12j. 

 The declination corrections of height are (for 7°), 



h 



Plymouth ... -28 + -15 . *, 2 9 -- 9 ; 

 Bristol, 1834, -9 +-6 

 1835,1-1 +-3 



1836, 1-5 +-7 



1837, 1-3 +-5 .s,2(p— 15J. 



I do not compare with these the declination corrections for London and Liverpool, 

 because they are calculated from a different mean declination (15°), and therefore a 

 difference might not prove a real discrepancy. For the same reason the Bristol re- 

 sults for different years are not to be expected to agree exactly. 



The mean declination of the moon, about which the effects balance each other in 

 an entire revolution of her nodes, appears by calculation to be about 16J°. It is this 

 declination which should, in the Tables, have the correction ; and the semimen- 

 strual inequality of all years must be taken for this mean declination, in order to 



s,2<p-' 

 s,2(p- 14 ; 

 *, 2?)- 15^; 

 ^, 2(p- 15i; 



