33S Mr. Harvey’s experimental inquiries relative to the 
as the maximum intensity of the middle section on the same 
deck. The greatest intensity also was found at U, situated, 
as will hereafter appear, in the same transverse vertical plane 
as the maximum intensity of the larboard section of the main 
deck, and the greatest intensities of the middle and starboard 
sections of the lower deck. The former effect was produced 
by a carronade, which was stowed away amidships ; and in 
the latter case, from the oscillating bar being between two 
carronades. The transverse plane also, in which the point 
F' of minimum intensity was found, was observed to be at 
nearly the same distance from the extreme point of the stem, 
as a similar plane passing through the point L # of maximum 
intensity was from the extreme part of the stern. 
In the corresponding section on the main deck the greatest 
intensity was found at B", in the same transverse vertical 
plane as the maximum intensity of the middle section, and 
the minimum intensity of the larboard section on the same 
deck. The minimum intensity was also discovered at I", in 
the same transverse plane as the minimum intensity of the 
larboard section on the lower deck. The intensities of the 
stations in this section very much exceed those of any other 
line of stations, their mean being 115.79. At the points A", 
B", C", D", E", the attractive power was very great, the mean 
of the intensities at those stations being 134.92 ; whereas 
the mean of the five succeeding stations was only 95.40, 
and that of the remaining points L", M", N", 117.88. The 
magnetic changes in this section were very considerable ; 
and it was farther remarked, that in the five positions first 
alluded to, no guns were near the line of stations ; and that 
therefore the great degree of intensity found in this part of 
