428 



Reports on Special Researches 



16000 



21000 



Nautical miles 



24000 



27000 





 -1° 

 if 



0° 

 -f 

 -2° 



tf 

 -1° 



jfOOO 30000 Nautical mOes 33000 



Fia. 34. — Showing Corrections of Magnetic-Declination Charts for the Pacific Ocean, 1912. 



36000 



(British Adrair.alty, 



United States Hydrographic OflBce, 



-; German Admiralty, 



