128 Land Magnetic Observations, 1911-13 



Synopses of Additional Magnetic Surveys, 1911-1913. 



Besides the surveys and trips briefly described in the foregoing field reports, the 

 following work was undertaken during the period 1911-1913. 



H. E. Sawyer. In pursuance of instructions of September 16, 1912, and August 8, 1913, 

 Mr. Sawyer, after the division of Mr. Berky's party, left Timbuktu July 21, 1913, to 

 undertake work along the coast of West Africa. He followed the courses of the Niger and 

 Senegal rivers to the coast, arriving at St. Louis, Senegal, October 20, 1913. From this 

 point he traveled by means of coast steamers along the west coast of Africa towards Lagos, 

 from which point a general magnetic survey of Nigeria was started by him in 1914. By the 

 end of 1913 he had worked his way, observing at 19 points where steamers land, as far south 

 as Grand Bassam, Gold Coast. The results obtained by him will be found in the "Table 

 of Results." At some of the stations occupied, magnetic observations had been made 

 previously ; thus secular-change data were also obtained. 



W. F. Wallis. On October 17, 1913, Mr. Wallis left Washington to secure a series of 

 magnetic observations in northern Africa. He first proceeded to Rome, where he arrived 

 November 1. Here he reoccupied Mr. Sligh's station of 1911. From Rome he went to 

 Terracina in company with Professor L. Palazzo, with whose courteous assistance an 

 intercomparison with the magnetic standards of the Ufficio Centrale di Meteorologia e 

 Geodinamica was secured. Thence he traveled to Tripoli, obtaining observations at 

 Messina and Palermo en route, and arriving December 15. At the end of 1913, 2 stations in 

 Tripolitania had been secured, one of which was a reoccupation of Professor Palazzo's 

 station of 1905. Most cordial assistance was rendered Mr. Wallis at all places visited. 

 Especial acknowledgment, however, is due the Italian Minister of Colonies, Signor 

 Bertolini, and the Honorable Thomas Nelson Page, American ambassador to Italy, for 

 securing the requisite credentials. Professor L. Palazzo did everything in his power to further 

 the work, and the Honorable J. Q. Wood, at that time American consul for Tripolitania, 

 contributed greatly to the success of the expedition in Tripolitania. 



