TERRESTRIAL MAGNETISM, ETC. 501 



APPENDIX C. 



REMARKABLE LOCAL MAGNETIC DISTURBANCE 

 NEAR COSSACK (PORT WALCOTT), NORTH- 

 WEST AUSTRALIA. 



\_Bcingan account by Captain Creak, R.N ,F.R.S., of observa- 

 tions made subsequently to those described on pp. 255-266.] 



II. M. surveying vessel Penguin visited Cossack 

 on November 3rd, 1890, reaching the anchorage 

 without disturbance of either compass or dipping 

 needle, although such might have been expected 

 from the experience of the Meda on a previous 

 occasion in 1885. Observations of the magnetic 

 elements were made with absolute instruments at 

 different stations on shore, but these showed little 

 or no disturbance from normal values. 



On the 5th inst., when proceeding to sea with 

 Bezout Island bearing S. 79 W., distance 2 miles, 

 the north point of the compass was suddenly 

 deflected two points to the westward. The ship 

 was immediately anchored, and some hours of the 

 next day were spent in examining this anchor- 

 age and neighbourhood, the soundings giving 

 9 fathoms throughout. Observations were also 



