Tables 737 (concluded) and 738 c%g 



MEAN ANNUAL VALUES OF MAGNETIC ELEMENTS AT OBSERVATORIES 



** Superseded in 1920 by Toolangi. ww January 1, 1923, the variation observatory was transferred to Amberly 

 but all results subsequently are referred to basis of the old station at Christchurch. " Means, 10 months, 

 March to December in 1902 for all elements, and 9 months, January to September in 1910 for Z. w Mean, 

 11 months, February to December. zz Mean, 10 months, March to December. 



TABLE 738.— Bibliography 



Gauss, K. F. 1839. Theorie der Erdmagnetismus. Resultate des Magnetischen Vereins. Gesammelte Werke, 

 vol. 5, Gottingen, 1867. 



Lamont, J. 1849. Handbuch des Erdmagnetismus. 



Giinther, S. 1897. Handbuch der Geophysik, vol. 1, pt. I, Stuttgart. 



Schmidt, A. 1898. Der magnetische Zustand der Erde. Archiv der Deutschen Seewarte, Hamburg. 



Mascart, E. 1900. Traite de magnetisme terrestre. Paris. 



Chree, C. 1911. Terrestrial magnetism. Encyclopedia Britannica, nth ed. 1912. Studies in terrestrial mag- 

 netism. London. 



Schmidt, A. 1917. Erdmagnetismus. Encyklopadie der mathematischen Wissenschaften, vol. 6, Leipzig. 



Auerbach, F. 1920. Magnetismus. Graetz, Handbuch der Elektrizitat und Magnetismus, vol. 4. 



Nippoldt, A. 1921. Erdmagnetismus, Erdstrom, Polarlicht. Sammlung Goschen, no. 175, Berlin. 



Chapman, S. 1922. Theories of terrestrial magnetism. Dictionary of Applied Physics, London. 



Angenheister, G. 1927. Erdmagnetismus. Geiger und Scheel, Handbuch der Physik, vol. 15. Berlin. 



Nippoldt, A. 1928. Der Erdmagnetismus. Muller-Pouillets Lehrbuch der Physik, vol. 5, Braunschweig. 



Angenheister, G., and Bartels, J. 1928. Das Magnetfeld der Erde. Wein und Harms, Handbuch der Experi- 

 mentalphysik, vol. 25, pt. I. 



Bartels, J. 1929. Erdmagnetismus, Erdstrom und Polarlicht. Gutenberg, Lehrbuch der Geophysik. 



Hazard, D. L. 1929. The earth's magnetism. U. S. Coast and Geodetic Survey. 



Nippoldt, A. 1929. Erdmagnetismus und Polarlicht. Einfiihrung in die Geophysik II. 



Hazard, D. L. 1930. Directions for magnetic measurements. V. S. Coast and Geodetic Survey. 



Journal of Terrestrial Magnetism and Atmospheric Electricity, Baltimore, from 1896, vol. 38 in progress. 



Zeitschrift fur Geophysik, Braunschweig (from 1924). 



Caractere magnetique de chaque jour, De Bilt (from 1906); Caractere magnetique numerique des jours, De 

 Bilt (from 1930). 



Atlas des Erdmagnetismus, Neumayer, Gotha, 1891. 



Reports and publications of Department of Terrestrial Magnetism, Carnegie Institution of Washington, and 

 of individual observatories (see table of mean annual values). 



Isomagnetic charts, Deutsche Seewarte, 1920; British Admiralty. 1927; U. S. Hydrographic Office, 1930. 



Smithsonian Tables 



