DEPARTMENT OF TERRESTRIAL MAGNETISM. 285 



shipped to Jersey City, where the remodehng was carried out by the 

 James Craig Engine and Machine Works, the builders of the engine. 



On April 18, 1919, the Carnegie left Washington under tow, arriving 

 at Baltimore the following day. The vessel was overhauled and exten- 

 sive repairs and alterations were undertaken under the direction of the 

 Spedden Shipbuilding Company of Baltimore. The vessel was hauled 

 out on Booz Brothers marine railway on May 13, 1919, and was 

 resheathed with yellow metal and copper. This work was completed 

 on May 22, but upon attempting to haul the vessel down into the 

 water again, the cradle of the marine railway left the track and could 

 not be moved. Special launching v/ays were constructed, which 

 required not only careful planning but also very much time, as prac- 

 tically all the work had to be done by divers. Every precaution was 

 taken to insure the safety of the vessel during these operations. After 

 numerous delays, the vessel was finally afloat again on August 21. 



The Carnegie then returned to the Spedden Shipbuilding Company, 

 where the remodeled engine was installed. For the storage of the 

 gasoline, two copper tanks, each 6 feet in diameter and 10 feet long, 

 were installed in the former producer room. Each tank carries 2,100 

 gallons of gasohne. Every care was taken in the construction of the 

 tanks and in the installation of the entire power plant to insure safety 

 in the storage and use of this fuel. 



The installation of electric storage-battery for lighting and low power 

 uses was an important addition. All fittings and fixtures were made of 

 non-magnetic material wherever possible, and twisted cable was used 

 for the circuits. The 1-kilowatt, 40-volt generator, which is to charge 

 the storage battery, was mounted in the after end of the engine-room, 

 as far as possible from the positions of the observing instruments. This 

 generator is to be operated by the 6-horsepower kerosene engine at 

 times when magnetic work is not in progress. 



The delays in the completion of the gasoline tanks and in getting the 

 Carnegie off the marine railway compelled a postponement of the 

 sailing date from Washington until October 9. 



The personnel of the Carnegie party is as follows: J. P. Ault, in com- 

 mand; H. F. Johnston, magnetician, second in command; Russell 

 Pemberton, surgeon; A. Thomson and H. R. Grummann, observers; 

 R. R. Mills, junior observer; A. Erickson, first watch officer; C. E. 

 Leyer, engineer; L. Miehle, second watch officer; C. Strom, boatswain; 

 2 cooks; 1 mechanic; 8 seamen; 2 cabin-boys; the entire personnel thus 

 consists of 23 men. 



After completing the swing and standardizing magnetic and electric 

 observations in the Chesapeake Bay, off Solomons Island, where the 

 Director and Messrs. Fleming and Mauchly made a final inspection, 

 she sailed from Hampton Roads October 19, bound for Dakar, Senegal, 

 and arriving there after a stormy passage, on November 24. 



