Observations on the Variation and Dip of the Needle. 169 
the register thermometer, was exactly 60° ; and this was exactly 
at the time of greatest obscuratioh* 
The wind was SW. through the day, ft gentle breeze, lintil 
about one o’clock, when it blew in gusts, but soon subsided; 
and about four or five o’clock it was nearly calm. 
In the Table, the time was taken by my watch; which was 
afterwards found by Mr Roskell to be slower than the true 
time at Liverpool. 
Liverpool, 1 
November 1821. j 
AaTi XXX . — Observations on the Variation and Dip of the 
Needle, made during Kotzebue's Voyage (^Discovery. 
H Avixa already laid before our readers the magnetical ob- 
servations which have been made during the recent expe- 
ditions to the Arctic Regions, we have been at some pains to 
collect, from the Account of Kotzebue’s Voyage of Discovery, the 
Various observations on the variation and dip of the needle 
which are Scattered through that work. 
Although the Ruriek navigated that part of the South Paci» 
fic Ocean where the variation curves are returning lines, which 
have a sort of pear-shape^ yet Captain Kotzebue’s observations 
do not commence till he had passed through the most interest- 
ing group of these curves. It is to be regretted, too, that his 
observations ceased, when he was navigating that portion of the 
Indian Sea, where he must have crossed no less than three times 
the line of no variation, which suifers such singular inflexions in 
that part of the world. 
In the following Table of observations, we have added in the 
last column the declination of the needle, as given in Hansteen’s 
variation chart, which we have published in a preceding volume. 
The agreement between these measures and those of Kotzebue, 
is very remarkable. 
