350 
CAPTAIN E. W. CREAK ON THE MAGNETICAL 
Perirn Inland. 
Two stations two miles apart were selected on this island for the absolute observa¬ 
tions : (1) at Signal Hill, near the west end of the island and about 100 feet above 
the sea; (2) the high lighthouse near the east end, about 200 feet above the sea, the 
instruments being set up on lava rock. There were also three auxiliary stations 
where the Fox apparatus was employed, and relative observations made : Nos. 1 and 2 
on the north coast, on broken coral; and No. 3 in a sandy bay at the S.E. end of the 
island. The declination was only observed at the high stations with a value at both 
— 3° 1G' W. Comparing this with the value obtained on board by swinging in 
19 fathoms of water = 3° 25' W., the difference of 9' shows but small disturbance. 
Inclination —With this element there is a difficulty in obtaining an exact normal 
value, but as the observation at Auxiliary Station No. 3 was made on a sandy beach, 
and the results agree with the Chart of Normal Values at the Admiralty, it has been 
adopted. 
Station. 
Observed Hip. 
Normal. 
• 
Disturbance. 
Signal Hill. 
o i 
5 27 N. 
3 30 
O / 
+ 1 57 
High Lighthouse . 
5 3 
. • 
+ 1 33 
Auxiliai-y Station No. 1. 
5 4 
• , 
+ 1 34 
Auxiliary Station No. 2 . 
5 4 
• • 
+ l 34 
| 
Horizontal Force .—Assuming the value of IT at Auxiliary Station No. 3 as normal, 
we have the following :— 
o 
Station. 
. 
Observed H. 
Normal. 
Disturbance. 
Signal Hill. 
•359 
355 
-4--004 
High Lighthouse . 
Auxiliary Station No. 1 . 
•341 
•355 
-•01i 
— 0 
Auxiliary Station No. 2 . 
•352 
• • 
-•003 
Baudin Island. 
On this island the three elements were observed at two stations : (A) on the south 
slope of the island, on hard compact gray sandstone, with fragments of ironstone, 
situated 100 feet above the sea; (B) on the foreshore, where the beach consisted of 
coralline sand and coralline limestone. Two specimens of rock from this island were 
found to be magnetic, with values of k = ‘000217 and ‘000529 in C.G.S. units (see 
Appendix B). 
Station B values have been adopted as the normal for the following reasons. The 
