CAPTAIN SABINE ON THE DIP OF THE 
52 
level, and the mode of observation was the same in every particular. The needle 
was fitted with a screw and weights, on Professor Meyer’s plan. 
Exp X f Marked en d a N. Pole. 
Aug- IB. |^ Marked end a S . p 0 ie. j 
W. below ; 52° 05'.5 
above ; 89 38 .0 
W. below ; 56 1 1 .9 
W. above; 85 12.3. 
>Dip 69° 01' 
Ea/t i j j c t> i fW. below; 62 24.0^k 
-p. VT 1 Marked end a S. Pole. < r , ^ I 
Exp. XI. J { W. above ; 77 54 .0 1 
1 
Aug. 19. ) Marked end a N< p 0 i e 
•{ 
W. below ’; 62 19.0 ( >Dip 69 42 
W. above ; 77 42 .5 J 
/ Marked end a N Pole f ^ e ^ ow ; 63 3 7 - 3 
Marked ena a JN. Foie, j w aboye . ^ 46 Q 
AUg - 19 - f Marked end a S. Pole. { ™ ^ j % £ * 
f W. below ; 55 39 .0 
\ W. above ; 87 30 .0 
f W. below ; 53 32 .0 
I W. above ; 90 58 .0 
Mean 
Exp XIII J Marked en<4 a S- Pole. 
Aug. 20. Mar ked end a N. Pole 
Dip 70 38 
Dip 70 04.5 
69 51 .4 
The several results which have been enumerated, being collected in one 
view, are as follows : 
Instrument of 12 inches diameter. Observer, Captain Sabine. 
Exp. I, II, & III, with a common needle 69°46'.l 
Exp. IV, V, VI, & VII, with Meyer’s needle 69 47 .4 
Exp. VIII, with a needle having an adjustable axis . . 69 38 .3 
Exp. IX, with Mr. Dollond’s needle 69 5 1 .7 
Instrument of 6 inches diameter. Observer, Mr. Douglas. 
Exp. X, XI, XII, & XIII, with Meyer’s needle .... 69°51'.4 
Mean ... 69 47 .0 
Whence the final result of the dip in the Horticultural Garden at Chiswick, 
in August 1828, is 69° 47' North. 
The result of the observations in August 1821 was 7 0° 04'.5 (Phil. Trans. 
1 822 : Art. I.) ; whence the dip in London appears to have diminished 17'.5 in 
