IIvIvUSTRATlONS 



Opposite page 



1 Sketch Map of Camp Abruzzi, Teplitz Bay 12 



2 Detailed Drawings of Magnetic Observatory at Camp Abruzzi, Teplitz Bay . . 14 



3 Diagram Showing Variation in Mark Reading with Changes in Temperature at 



Teplitz Bay from September 28, 1903, to February 19, 1904 . . . .16 



4 Diagram Showing Variation in Mark Reading with Changes in Temperature at 



Teplitz Bay from February 20, 1904, to July i, 1904 17 



5 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period October 4, 



1903, to October 30, 1903 276 



6 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period November 



I, 1903, to November 28, 1903 277 



7 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period November 



29, 1903, to December 26, 1903 .......... 278 



8 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period December 



27, 1903, to January 23, 1904 .......... 279 



9 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period January 



24, 1904, to February 20, 1904 . . . . . . . . . . 280 



ID Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period February 



21, 1904, to March 19, 1904 .......... 281 



1 1 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period March 20, 



1904, to April 16, 1904 ........... 282 



12 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period April 17, 



1904, to May 14, 1904 ........... 283 



13 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period May 15, 



1904, to June II, 1904 ........... 284 



14 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Period June 12, 



1904, to July I, 1904 285 



15 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Whole Period of 



Observation, October 4, 1903, to July i, 1904 ....... 286 



16 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Month of July, 



1903, as Interpolated from the Entire Series ....... 287 



17 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Month of August, 



1903, as Interpolated from the Entire Series . . . . . . .288 



18 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Month of Sep- 



tember, 1903, as Interpolated from the Entire Series ...... 289 



19 Diurnal Variation in Magnetic Declination at Teplitz Bay for the Year July, 1903, 



to June, 1904, Showing the Summer and Winter Ranges ..... 290 



20 Annual Variation in Magnetic Declination at Teplitz Bay 306 



21 Sketch Map of Camp Ziegler, Alger Island 322 



22 Detailed Drawings of Magnetic Observatory at Camp Ziegler, Alger Island . . 324 



23 Diurnal Variation in Magnetic Declination at Alger Island for the Period June 26, 



1905, to July 31, 1905 354 



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