LAND MAGNETIC OBSERVATIONS, 1911-1913. 



INTRODUCTION. 



The present i^ublication is the .second of the series by the Department of Ter- 

 restrial Magnetism of the Carnegie Institution of Washington bearing the general 

 title "Researches of the Department of Terrestrial Magnetism." Under this head 

 the results of the various operations and researches conducted by this Department 

 are being published. While the subject treated at first is chiefly that of the Earth's 

 magnetism, from time to time memoirs will appear on other more or less closely 

 allied subjects. With the increased facilities for research, as related in another 

 section of this volume, the various subjects can now be given increased attention, 

 both in the field and in the laboratory. 



Each volume has a subtitle setting forth briefly its special contents. Thus the 

 first volvmie, designated in future as Volume I and entitled "Land Magnetic 

 Observations, 1905-1910," contained the results of all magnetic observations made 

 on land by the Department from the beginning of its observational work in February 

 1905 to the end of December 1910. The present volume, No. II, on "Land INIag- 

 netic Observations, 1911-1913," similarly contains the results of all magnetic obser- 

 vations made on land, this time those obtained during the three years, January 1, 

 1911, to December 31, 1913. There will also be found reports on certain special 

 researches. 



One of the special objects the general magnetic survey of the globe for which 

 the Department of Terrestrial Magnetism was founded on April 1, 1904, is now 

 rapidl}' nearing completion. According to present expectations, this general survey 

 for the portion of the globe between about parallels 70 N. to 65 S. will be com- 

 pleted at the end of 1916. As stated in the Introduction to Volume I, 



The chief endeavor on our part is to secure magnetic results in the regions where most needed 

 and where there are no organizations prepared to undertake the work. Where magnetic surveys are 

 in progress under competent direction and where the prospects for early completion are favorable, 

 the Department confines its work to the observations necessary for the proper correlation of results 

 obtained ^ith different instruments and by different methods and renders such assistance to organi- 

 zations as may be required. 



While the Department, as before, has extended special aid at times to certain 

 organizations, for the effective and expeditious accomplishment of their objects, 

 one of .such cases being the Australasian Antarctic Expedition, 1911-1914, it is a 

 pleasure to be able again to record and gratefully acknowledge here the cordial and 

 valuable aid it has itself continued to receive from magnetic institutions in all parts 

 of the world, as well as from the governmental and diplomatic representatives of 

 the countries visited by the various observers. 



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