SYNOPSES OF THE GALILEE'S CRUISES. 1905-1908. 

 CRUISE I, AUGUST TO DECEMBER 1905. 



After the various necessary alterations (see page 130) were completed, and an inspection 

 was made by the President of the Carnegie Institution of Washington, the Galilee was ready 

 to enter upon her duties in August 1905. Magnetic observations were made under the 

 Director's instructions and supervision, at various places on the shores around San Fran- 

 cisco Bay, from the results of which the most suitable place for swinging ship was determined. 

 The Galilee was then swung, with the aid of a tug, on August 2, 3, and 4, in San Francisco 

 Bay, between Goat Island and Berkeley, and the various ship's deviation coefficients were 

 thus ascertained. (See Plate 1, Fig. 1.) 



On August 5, 1905, the Galilee started from San Francisco on her first cruise, securing 

 magnetic observations daily to a greater or less extent, according to conditions of the 

 weather and sea, swinging twice under sail, and arriving at San Diego, August 12. This 

 fii-st short passage of the cruise was an experimental trip, various instruments and methods 

 being subjected to trials under the supervision of the Director, who accompanied the 

 expedition as far as San Diego for this purpose; during this trip he also completed the 

 training of the observers, and tested under sea conditions the deflecting apparatus devised 

 for measuring the horizontal intensity of the Earth's magnetic field. 



After some further alterations had been made at San Diego and the deviation coeffi- 

 cients had been redetermined, the Galilee again set sail on September 1, this time for the 

 Hawaiian Islands, and arrived at Honolulu on September 16. The shore observations 

 and the instrumental comparisons at the Honolulu Magnetic Observatory having been 

 completed, she left Honolulu September 28; after the vessel had been swimg at a point 

 abreast the Honolulu Magnetic Observatory, sail was set for Fanning Island, where the 

 Galilee arrived on October 10. When the necessary harbor swings and shore observations 

 at Fanning were completed, a course was taken south, on October 14, to about 1?6 south 

 latitude in longitude 197?3 east, which point was reached on October 17; next a northwest- 

 ward course was followed to about meridian 190?5 east, thence to Honolulu, where the 

 expedition arrived on November 7. After completion of her observations, the Galilee left 

 Honolulu November 12, following a northwesterly course to about 28?2 north latitude and 

 longitude 196?5 east, from which point she proceeded to a point somewhat north of lati- 

 tude 41 ?2 in longitude 209?7 east, and thence she followed a direct course to San Diego. 

 The first cruise was thus completed at San Diego on December 9, 1905, a distance of 10,571 

 nautical miles having been covered. The necessary swings and closing shore observations 

 were made at San Diego between December 11 and 18. 



The commander of the vessel on this cruise was J. F. Pratt, an experienced officer of 

 the United States Coast and Geodetic Survey. By the courtesy of the Secretary of Com- 

 merce and the Superintendent of the Coast and Geodetic Survey, he was granted the neces- 

 sary furlough, and entered the temporary employ of the Department of Terrestrial Mag- 

 tism for the puipose of assisting the Director in the inauguration of the magnetic survey of 

 the ocean areas, and to prepare the vessel for the purposes of the expedition. The other 

 members of the vessel's scientific personnel were: Dr. J. Hobart Egbert,' magnetic observer 

 and surgeon; J. P. Ault, magnetic observer; and P. C. Wliitney,' magnetic observer and 

 watch officer. The sailing-master was Capt. J. T. Hayes. For a fuller account of the cruise 

 see J. F. Pratt's report (pp. 128-134) and abstract of log (pp. 141-143). 



'Member of the United States Coast and Geodetic Survey, courteously granted the required furlough to enter the 

 temporary employ of the Department of Terrestrial Magnetism. 



10 



