TEXT-FIGURES. 



Fio. 1. Plana of the Observing-Bridge on the Golike '^^f 



Fio. 2. Curves showing Dip-Needle Corrections for Sea Dip-Circle 169 during Cruise III 73 



Fig. 3. Curves showing Time-Changes in Values of Intensity Constants for Sea Dip-Circle 169' during Cruise ill ' ' ' 74 



fio. 4. Section of the Galilee showing Iron Fastenings ,™ 



Fio. 5. Discussion of Alidade Correction for Standard Compass ,0^ 



Fig. 6. Discussion of Alidade Correction for Standard Compass j,7 



Fig. 7. Discussion of Alidade Correction for Standard Compass. . ,,0 



Fig. 8. Sail Plan of the Carnegie ' '.'.'.'.'.'.'.'.'.'.'.'.". 161 



Fig. 9. Inboard Profile, General Arrangement, and Deck Plan of the Carnegie. 152 



Fio. 10. Theory of Marine C^oUimating-Compass for Magnetic Declination . 178 



Fio. 11. Theory of Marine Collimating-Compass for Magnetic Declination 184 



Fio. 12. Theory of Marine Collimating-Compass for Magnetic Declination igo 



Fio. 13. Showing Relative Positions of Magnetic Instruments on the Carnegie 202 



Fio. 14. Showing Track of the Carnegie's Sub- Antarctic Voyage, December 6, 1915 to April 1 1916 190 



Fig. 15. Cruise I of the Carnegie, 1909-1910 . . 3gg 



Fio. 16. Conductivity of the Atmosphere, December 18-19, 1909 . . ta-j 



Fio. 17. Cruise II of the Camenie, 1910-1913 „„ 



Fio. 18. Cruise III of the Cartiegie, 1914 „, 



Fig. 19. Cruise IV of the Carnegie, 1915-1916 (AprU) 378 



Fig. 20. Diagram of Potential-Gradient Apparatus 381 



Fio. 21. Wiring Scheme for the Atmospheric-Electric House on the Carnegie 383 



Fig. 22. Diagram of Conductivity Apparatus 38S 



Fio. 23. Diagram Illustrating Attachment to Upper End of Central Rod of Ion-Counter. . ^.. 337 



Fio. 24. Diagram of Collecting System of Radioactive-Content Apparatus 390 



Fio. 25. Diagram of Water-Dropper -n , 



Fio. 26. Ocean Diurnal-Variation Curves for Ionic Content. Potential Gradient, and Penetrating Radiation 417 



Fig. 27. Companson of the Potential-Gradient Diurnal- Variation Curve for the Ocean with Those for Various Land 



Stations ,.g 



Fio. 28. Variation of Atmospheric-Electric Elements During a Period of Four Months on the Sub^Antarctic Voyage 421 



iiG. 29. Showing Corrections of Magnetic-Declination Charts for the Atlantic Ocean, 1909-1911. . . 424 



Fig. 30. Showing Corrections of Magnetic-Declination Charts for the Atlantic Ocean, 1913 and 1915. 426 



Fig. 31. Showing Corrections of Magnetic-Declination Charts for the North Atlantic Ocean, 1914 , . ' 425 



Fig. 32. Showing Corrections of Magnetic-Declination Charts for the Indian Ocean, 1911-1912 426 



Fig. 33. Showing Corrections of Magnetic-DeeUnation Charts for the Sub-Antarctic Voyage of the Carneoie, 1915- 



1916 427 



Fio. 34. Showing Corrections of Magnetic-Declination Charts for the Pacific Ocean, 1912 428 



Fio. 35. Showing Corrections of Magnetic-Declination Charts for the Pacific Ocean, 1915-1916 429 



▼n 



C: 



