CONTENTS 



Page 



Introduction .5 



Stations ... 5 



Instruments 5 



Magnetometer Constants ....... 6 



Dip Circle Constants .... . .n 



Observations at Teplitz Bay ... 13 



Site of Observatory 13 



Description of Magnetic Observatory ."T 13 



Permanence of Site and Preservation of Piers ..... 14 



Declination 15 



Azimuth Marks ...... .... 15 



Pier AT and Its Twist ... . 16 



Program and Methods of Observing 17 



Axis Observations .... . . . . 18 



Torsion 19 



Records .............. 19 



Tabulations of Records ........... 20 



Notes Accompanying Declination Records at Teplitz Bay . . . -32 



Tabulation of Magnetic Declinations Observed at Teplitz Bay . . . .41 



Reductions from Declination Observations at Teplitz Bay 275 



Diurnal Variation 275 



Formulae Representing Diurnal Variation in Magnetic Declination at Teplitz Bay 290 

 Characteristics of Diurnal Variation in Magnetic Declination at Teplitz Bay . 295 

 Magnetic Disturbances ........... 302 



Secular Change in Magnetic Declination ........ 303 



Annual Variation in Magnetic Declination ....... 306 



Inclination .............. 307 



Instruments and Methods 307 



Results .............. 309 



Secular Change in Magnetic inclination . . . . . . . .312 



Horizontal Intensity ............ 313 



Instrument, Methods, and Results . . . . . . . . -313 



Secular Change in Magnetic Horizontal Intensity . . . . . - . 318 



Summary Showing Values of the Magnetic Elements and Their Secular Variations 



at Teplitz Bay ............. 320 



Observations at Alger Island . . . . . . . . . . . -321 



Site of Observatory . . . . . . . . . . . . .321 



Declination . . . . . . . . . . . . . .321 



Methods . . . . . . . . . . . . . .321 



Records . . . . . . . . . . . . . .321 



Tabulations of Records ........... 322 



Notes Accompanying Declination Observations at Alger Island .... 324 



Tabulation of Magnetic Declinations Observed at Alger Island .... 325 



Reductions from Declination Observations at Alger Island ..... 354 



Diurnal Variation ............ 354 



Inclination .............. 356 



Instrument, Methods, and Results 356 



Horizontal Intensity ............. 356 



Instrument, Methods and Results ......... 356 



Summary of Magnetic Elements at Alger Island ....... 357 



Miscellaneous Observations ............ 358 



A Tromso, Norway ............ 358 



B Archangel, Russia 358 



C Barents Sea ............. 358 



D Determinations on Plane Table Traverse ........ 359 



