314 CARNEGIE INSTITUTION OF WASHINGTON. 



On March 6, 1915, the Carnegie left Brooklyn on her fourth cruise, 

 to extend over a period of about two j^ears, under the command of Mr. 

 J. P. Ault, who had been in charge of the previous cruise. After com- 

 pleting the control-observations in Gardiners Bay, the vessel sailed 

 on March 9, and after a successful trip of 15 days, arrived at Colon, 

 Panama. She proceeded next through the canal, thence to Honolulu, 

 which port was reached on May 21 . En route from Balboa to Honolulu 

 during a passage of 39 days, a region of the Pacific was thoroughly 

 covered for which but few magnetic data had been obtained previously. 



At the Honolulu Magnetic Observatory an elaborate program was 

 carried out of intercomparisons of all instruments used aboard the 

 Carnegie, as well as between the magnetic standards of the Department 

 and those in use at this observatory. During this time the vessel 

 received some overhauling, and on June 29 and July 3 she was swung 

 off Pearl Harbor, at the same place where the observations on the 

 Galilee had been made in 1907. 



July 3, the Carnegie sailed from Honolulu, reaching Dutch Harbor, 

 Alaska, on July 20. On August 5 the vessel started on her long con- 

 tinuous passage of about 8,000 miles to Port Lyttelton, New Zealand, 

 where it is expected she will arrive early in October. By the end of 

 the fiscal year the Carnegie will be outfitting to circumnavigate the 

 regions in the southern hemisphere, between the parallels of about 55° 

 to 60° south. 



Thus, between Alarch and October of 1915, the Carnegie will have 

 sailed from the Atlantic into the Pacific, and from Dutch Harbor, 

 Alaska, to Port Lyttelton, New Zealand, the total distance covered 

 being about 18,000 nautical miles. The aggregate length of the cruises 

 accomphshed with this vessel from August 1909 to October 1915 

 approximates 129,000 nautical miles. Even including all stops, delays, 

 and periods when out of conunission, the Carnegie has, therefore, 

 averaged a distance per year equal to a complete circumnavigation of 

 the globe along a great circle. The aggregate length of the cruises of 

 both the Galilee and the Carnegie, 1905-1915, is about 190,000 nautical 

 miles, or 219,000 statute miles, hence nearly 9 times the Earth's 

 circumference. 



As has been the case in previous years, the hydrographic establish- 

 ments engaged in the construction of navigation charts have been kept 

 supphed promptly wdth the magnetic data of interest to mariners. 

 Usually they are in the possession of the data obtained on the Carnegie 

 within 2 or 3 months after the observations have been made. Thus, 

 for example, at the end of August there were transmitted to these hydro- 

 graphic bureaus magnetic data obtained by the Carnegie on the passage 

 from Honolulu to Dutch Harbor, during the previous month, July 3-23. 

 There are letters in our files showing that foreign institutions receive 

 from us magnetic data more promptly than they can get them from 

 vessels and organizations of their own countries. 



