130 The National Geographic Magazine 



Department of State by the Superin- 

 tendent as Commissioner of the United 

 States in cooperation with the Com- 

 missioner of Great Britain. 



The various operations of the mag- 

 netic survey of the country show a 

 gratifying progress during the year. 

 The determination of the magnetic dec- 

 lination, dip, and intensity was made in 

 327 localities, embracing 367 stations, 

 distributed over 24 states and territories 

 and 2 foreign countries. An extensive 

 investigation was made of the marked 

 local disturbances in the vicinity of Ju- 

 neau, Alaska, 45 stations being occu- 

 pied for this purpose. In cooperation 

 with the Louisiana Geological Survey, 

 the magnetic survey of the state was 

 completed. Effective cooperation was 

 secured with an expedition sent to the 

 Bahama Islands by the Baltimore Geo- 

 graphical Society, and valuable results 

 were thus obtained without expense to 

 the Survey. 



Excellent progress was made in se- 

 curing magnetic observations at sea 

 during the voyages of the ships of the 

 Survey to and from their fields of work. 

 In the Atlantic and Pacific Oceans 92 

 results of magnetic declination and 33 

 results of magnetic dip and intensity 

 were thus obtained, nearly all of them 

 derived from complete swings of the 

 ships forward and back. 



Continuous records of the variations 

 of the magnetic elements were secured 

 throughout the year at five magnetic 

 observations situated at Cheltenham, 

 Md. ; Baldwin, Kans. ; Sitka, Alaska ; 

 near Honolulu, Hawaii, and Vieques, 

 P. R. During the year a large number 

 of magnetic storms were recorded, the 

 most remarkable one occurring October 

 3 1 -November 1. 



During the year a bureau of inter- 

 national research in terrestrial magnet- 

 ism was created by the Carnegie Insti- 

 tution of Washington, with an officer 

 of the Survey, the inspector of magnetic 

 work, in charge as director. 



A continuous record of tide observa- 

 tions with self-registering gauges was 

 obtained during the year at 8 stations, 

 including 1 station at Hawaii and 1 in 

 the Philippine Islands, and for a por- 

 tion of the year at an additional station 

 which was established on the Gulf of 

 Mexico, at Galveston. 



The electric tide indicator installed 

 in the Maritime Exchange at Philadel- 

 phia continued to give satisfaction. A 

 similar apparatus was installed during 

 the year in the Maritime Exchange at 

 New York. 



The tide indicators established for 

 the use of mariners in New York har- 

 bor, in the Delaware River at Reedy 

 Island, and in San Francisco Bay con- 

 tinued in operation during the year. 



Compass deviation ranges were es- 

 tablished by marks placed on the inner 

 Delaware breakwater, which will prove 

 of great value to shipping, as any ves- 

 sel can now determine the corrections 

 to her compass while swinging at an- 

 chor in the national harbor of refuge. 



The field work necessary for the re- 

 vision of two volumes of the United 

 States Coast Pilot, covering the coast 

 from Point Judith, R. I., to Chesa- 

 peake Bay entrance, Virginia, was com- 

 pleted. 



Hydrographic surveys were made in 

 16 states and territories, topographic 

 surveys in 9, triangulation in 14, and 

 leveling in 6. 



The primary triangulation along the 

 Pacific coast north of San Francisco 

 was continued. 



In Alaska a survey was made of Da- 

 vidson Inlet, work was continued in 

 Prince William Sound, and two vessels 

 were dispatched to make a survey of 

 Kiska harbor, Aleutian Islands. 



In Porto Rico hydrographic work 

 was continued in the harbors and bays 

 and offshore. 



The experts of our Department of Ag- 

 riculture are constantly on the hunt for 



