distribution , &c. of the magnetic intensity in ships of war. 353 
The diversities which prevail in the above intensities, must 
be attributed to the unequal distribution of the iron in the 
different ships, and to the varied directions of their heads. 
No definite relation appears to exist between the magnitudes 
of the ships, and the several results. The example of he 
Cornwallis deserves notice, as having the intensities of all its 
stations singularly below the assumed terrestrial intensity. 
It may be proper to add, that these ships were in a state of 
ordinary, in Hamoaze, and that the intensities are therefore 
due to the hull alone. 
As a useful practical remark it may be added, since some 
difference of opinion has existed on the subject, that during 
the course of these experiments it has appeared, that the 
changes and diversities of intensity on board small ships of 
war, are more considerable than those which take place in 
vessels of a larger class. 
The mean latitude of the positions of the ships may be re- 
garded as 50° 22' 53" N ; and longitude 4 0 14' 44 " W. 
Plymouth, May i, 1823. 
MDCCCCXXIV. 
Zz 
