ANSWERS TO PROBLEMS 



139 



ANSWERS TO PROBLEM 2 



(♦Indicates answers] 



(A) 



(B) 



47°34' (47.6°) true. 

 58°34' (58.6°) magnetic. 

 210°26' (210.4°) true. 

 201°26' (201.4°) magnetic 



ANSWERS TO PROBLEM 3 



(C) 



(D) 



294°19.5' (294.3°) true. 

 297°49.5' (297.8°) magnetic. 

 117 °04' (117.1°) true. 

 103°22' (103.4°) magnetic. 



1. (6). 



2. (c). 



3. ia). 



4. (c). 



AnstDers 

 (1) False. 



(2) True. 



(3) False. 



ANSWERS TO PROBLEM 4 



5. ib). 8. (a). 



6. (6). 9. (6). 



7. (6). 10. (c). 



ANSWERS TO PROBLEM 5 



Comment 

 The red end of the needle is attracted to the port side of the ship 

 and the compass will need athwartship magnets red to port to un- 

 freeze it. 



The heeling magnet corrects, in addition to the permanent vertical 

 magnetism of the ship, induced vertical magnetism which changes 

 with latitude. 



There is no correlation between the size of the ship and the amount 

 of horizontal soft iron in the vicinity of the compass. 



