326 Mr. Harvey's experimental inquiries relative to the 
may be inferred, that the observed augmentation of intensity 
was to be partly attributed to the increased attraction of the 
ship. At G, g, a farther increase in the intensity was ob- 
served, particularly at the former station, occasioned by the 
proximity of the flukes of the sheet anchor, which lay across 
the main hatch way, and bore east and west of the instrument. 
After passing the last mentioned stations, however, a remark- 
able decrease in the intensity was perceived. At H, which 
was but little farther distant from the flukes of the anchor 
than the station at F, the intensity was only 98.87 ; whereas 
at the latter station, it was 118.2 6. At the stations K, L, M, 
there was an increase of intensity, occasioned by approaching 
the galley ; but after passing it at M, the intensity suddenly 
declined at N, but encreased a little at O, produced by the 
proximity of the station to the iron of the foremast and the 
anchor suspended from the starboard bow. 
From the stations A, a, to F ,/, the distribution of the iron, 
on each side of the middle section, appeared as far as a gene- 
ral observation could be made, to be very nearly similar ; 
and hence the intensities at the corresponding stations of 
the starboard and larboard sections, approached more nearly 
to equality than the intensities at the stations from G, g, to 
O, 0, on account of the chain cable, which proceeded from g 
to the larboard bow, paralled to the line of stations. 
If the means of the intensities of the three sections, as far 
as the transverse line of stations F f/, just abaft the main- 
mast be taken, they will present a remarkable approxima- 
tion to equality ; being for the 
Starboard section - 111.92 
Middle section - - 111.78 
Larboard section - 111.08 ; 
