L1EUT.-C0L0NEL SABINE ON TERRESTRIAL MAGNETISM. 17 
•00022 
Sabine .... 
Needle 
l(s r 
'00027 
Sabine .... 
Needle 
L (4) 
Account of the Euphrates 
Expedition. App. 
•00038 
Sabine .... 
Needle 
£(1) 
•00041 
Sabine .... 
Needle 
E (4L 
*000068 
Sabine .... 
Needle FitzRoy’s. Voyage of the Beagle. App. 
•00030 
Sabine .... 
Needle 
(3) 
Phil. Trans., 1840. Art. IV. 
•000055 
Ross and Sabine. 
Needle 
RL(4) 
Brit. Assoc. Report, 1838. 
•000436 
Bache .... 
Needle 
• (1)1 
•000423 
Bache .... 
Needle 
• (2) 
•000277 
Bache . . . 
Needle 
. (3) 
>Trans. Am. Phil. Soc., 1836. 
•000117 
Bache .... 
Needle 
. (A) 
•000052 
Bache .... 
Needle 
. (C) 
•000357 
Bache .... 
Needle 
(3 B)J 
•000359 
Christie . . . 
Needle 
• (1)1 
•000302 
Christie . . . 
Needle 
. (3) 
>Phil. Trans., 1836. Art. XIX. 
•000177 
Christie . . . 
NeedleLozenge 
•000227 
Christie . . . 
Needle 
. II 
•00036 
Duperrey . . . 
Needle 
• I] 
Mein de L’ Acad. Roy. de 
•000625 
Quetelet . . . 
Needle 
■ n J 
Bruxelles, tom. xiii. 
•00020 
Forbes . . . 
Needle 
. n 
„ Trans. R. S. Edin., vol. xiv. 
•00013 
•00026 
Whence, 
Forbes . . . 
Needle 
Fla£ 
[. 
T' = T [1 + '00026 (60° — f)], 
in which T is the time of vibration at any station, t the actual temperature in degrees 
of Fahr., and T' is the equivalent time at the temperature of 60°. 
The application of this correction gives the “ corrected time” in Table V. In the 
few cases where the rate of the chronometer exceeded an insignificant amount, a 
correction for the rate is also included in the “ corrected time,” and a memorandum 
of the rate itself is inserted in the column of remarks. 
Table V. contains an abstract of the observations at the different stations with the 
needles which have been specified : it includes every observation recorded to have 
been made with these needles between the 16th of March 1839 at Panama, and the 
22nd of March 1840 at Bow Island, except, 1st, two incomplete observations, one 
with No. 11. at Fort Vancouver, and one with No. 13. at San Francisco, in which 
either the vibration was interrupted, or the needles came to rest, before the usual and 
requisite number of vibrations had been made; and 2nd, some observations at Tepic in 
the neighbourhood of San Bias and at Mazatlan, in which the needles, for the sake 
of experiment, were vibrated in air artificially heated, or alternately in the sun and 
in the shade. 
MDCCCXLI. 
D 
