83 
Experiments and 'Discoveries . 
Local Attraction with the Plate affixed. 
Position 
of Ship’s 
Head by 
Plate 
Compass. 
Bearing of 
the Object 
by Plate 
Compass, 
Correct 
Magnetic 
Bearing of 
Object. 
/ 
Differ- 
ences. 
Position 
! of Ship’s 
Head by 
Plate 
Compass. 
[Bearing of 
the Object 
by Plate 
Compass. 
Correct 
Magnetic 
Bearing of 
Object. 
Differ- 
ences. 
South 
s gLio'w 
S 62°30 W 
O / 
+ 1 40 
North 
S 6 1° 3() W 
s efWw 
o / 
— 10 
S by E 
63 30 
do. 
4- 1 0 
N by W 
61 30 
do. 
— 1 0 
SSE 
65 30 
do. 
+ 30 
NNW 
61 40 
do. 
— 0 50 
SE by S 
65 30 
do. 
+ 3 20 
N W by N 
61 50 
do. 
— 0 40 
SE 
64 10 
do. 
+ l 40 
NW 
62 50 
do. 
+ 0 20 j 
SE by E 
62 40 
do. 
+ 0 10 
NWbyW 
63 30 
do. 
+ 1 0 
ESE 
61 30 
do. 
— 1 0 
WNW 
64 40 
do. 
+ 2 10 
E by S 
61 20 
do. 
— 1 10 
W by N 
65 0 
do. 
+ 2 30 
East 
60 0 
do. 
- 2 30 
West 
64 20 
do. 
+ I 50 
E by N 
60 10 
do. 
— 2 20 
W by S 
63 40 
do. 
+ 1 10 
ene 
62 30 
do. 
0 0 
wsw 
63 40 
do. 
+ 1 loj 
NE by E 
63 30 
do. 
+ 1 0 
SW by W 
58 20 
do. 
— 4 10 
ne 
62 20 
do. 
— 0 10 
sw 
59 0 
do. 
— 3 30 
NE by N 
63 0 
do. 
+ 0 30 
SW by s- 
58 20 
do. 
— 4 10 
nne 
62 20 
do. 
- 0 10 
ssw 
60 0 
do. 
— 2 30 
N by E 
63 0 
do. 
+ l o ! 
S by W 
61 20 
do. 
— 1 10 
These results will be found fully to bear out the representa- 
tion made of them by Captain Clavering to the Admiralty, who, 
in his letter to John Barrow, Esq, says, “ Having been direct- 
ed by their Lordships to make trial of Mr Barlow’s plate, un- 
der Mr Foster’s direction, I forward that gentleman’s report, 
which it will be unnecessary for me to comment upon, farther 
than to acknowledge the extreme practical utility of it, as found 
during the whole voyage ; as when once fixed abaft the com- 
pass (thereby neutralising the effect of the iron on board), no- 
thing farther was necessary than to allow for tire variation of the 
place.” 
And, in his letter to the author, he says, after speaking of 
the great amount of the attraction in the Griper : 
“ Under such circumstances, it is obvious that the compass 
would have been altogether useless (as indeed it has always 
been admitted to be in these high latitudes), but for your va- 
luable correcting plate, with which, as I have already stated in 
my report, we found the compass to which the apparatus was 
attached as serviceable in these latitudes as in anv other.” 
What is here alluded to is an advantage attending the plate 
beyond what the author had foreseen, viz. that it not only 
causes the compass to work correctly, but it also enables it to 
F 2 
