distribution, &c. of the magnetic intensity in ships of war. 345 
taneous and rapid manner, may be supposed to have unfolded 
some anomalies in the course of the present experiments, 
from the numerous alterations which took place in the bear- 
ings of the ship's head, and the consequent change of inten- 
sity of every mass of iron. 
In a preceding page, a table was introduced for the purpose 
of exhibiting the remarkable anomalies existing at different 
stations of the longitudinal sections abaft the mizen mast; 
but the succeeding observations relate to the changes which 
the intensity of the same station underwent in consequence 
of alterations in the bearings of the ship’s head. At the star- 
board station B", for example, the intensity was found to be 
154.36, when the direction of the ship’s head was SEby E^E, 
but declined to 52.85, when it bore W£N. At the larboard 
station b", likewise, the intensity was found to be 71.07, when 
the head was directed E-f-N, and increased to 147.64, when 
it turned to W f N. At the latter station also, when the 
vessel’s head was NW by N £ W, it amounted to 112.81. 
The intensity at the station / 3 " in the middle section was like- 
wise found to vary, but not in the same degree as the stations 
in the starboard and larboard sections. When the head, for 
instance, bore SE by E \ E, the intensity at the last mentioned 
point amounted to 108.47 ; and when, by the influence of the 
tide, the same part of the vessel was directed W by N, it de- 
clined to 103.79 ; an d when by the continued change of the 
ship’s position the head became N \ W, a farther declension 
took place to 99.43. These results however may be more 
clearly understood by a reference to the following table. 
MDCCCXXIV. 
Yy 
