RESULTS OF THE VOYAGE OF PI.M.S. PENGUIN. 
351 
ship was swung in 19 fathoms of water near the island in two successive years with 
the same results as regards Declination = 2° 11' E. The Dip and Force agree nearly 
with the best normal values on the charts. 
Disturbances. 
( . 
0. 
H. 
Station A. 
c / 
3 10 W. 
— 42*55 
•3572 
Station B, adopted normal . 
2 14 E. 
- 40-7 
•3574 
Disturbance. 
5 30 W. 
- 2-43 
•0002 
Port Walcott (Cossack). 
Although the name of the township of Cossack may be more familiar than the 
name of the port in which it is situated, still, as the observations about to be 
considered refer chiefly to the port approaches to Cossack, and extend over an area of 
some miles, the name Port Walcott has been adopted. 
The accompanying map of Port Walcott shows the relative positions of the points 
where land observations were made and the region of magnetic disturbance in land 
under the sea. The latter region we may hereafter refer to as the “ Magnetic 
Shoal,’’ over which the “magnetic soundings ’ * were taken (see post). 
Land Observations. 
There is the usual difficulty in this place of determining the normal values of the 
magnetic elements, but an observation was made with the Fox apparatus on board 
the ship in 19 fathoms when approaching the port, giving a corrected value of 51°. 
This reduced for difference of Dip, due to difference of the latitude, makes the Dip at 
Reader Head (see map) = 51° 16', the observation on land at the same place being 
= 51° 20'. 
Again, by swinging the ship 4 miles east of Reader Head station, the Declination 
was observed to be = 0° 15' E., as compared with 0° 4' W. on the head. 
The station at Reader Head being also in a sandy neighbourhood, was therefore 
adopted as the position of normal values. 
* The term “magnetic soundings” is here meant to apply to the several magnetic disturbances in 
analogy with the soundings taken to determine the position and extent of a shoal of sand, for example. 
—E. W. Crkak. 
