318 CARNEGIE INSTITUTION OF WASHINGTON. 



Mr. J. P. Ault. These improvements were satisfactorily completed by 

 February 17, on which day the Carnegie returned to her berth in 

 Beard's Yacht Basin to be put in commission. While the above work 

 was being done to the vessel, the magnetic instruments were being 

 examined, repaired, or altered in the Department shop as required for 

 the coming cruise, and their constants were redetermined. 



After a final inspection of the vessel by the Director and Mr. Peters, 

 the Carnegie, on March 6, left Brooklyn for Gardiners Bay, where she 

 was successfully swung on March 7 and 8, preparatory to putting to sea. 

 This was the Carnegie's fifth visit to Gardiners Bay for the purpose of 

 swinging ship. The results of these swings, made in 1909, 1910, 1913, 

 1914, and 1915, confirm the existence of local magnetic disturbance in 

 Gardiners Bay and furnish the desired control on the accuracy of the 

 magnetic work aboard the Carnegie. Dr. W. F. G. Swann remained 

 on board to the last moment to complete the installations and tests of 

 the new atmospheric-electric instruments which had been constructed in 

 the Department shop for this cruise, in accordance with his suggestions. 

 In this work he was assisted by Dr. Mauchly and H. F. Johnston. 



The Carnegie sailed from Gardiners Bay on March 9, 1915, bound for 

 Colon, Panama, the ship's personnel being as follows: J. P. Ault, 

 magnetician and in command of the vessel; Dr. H. M. W. Edmonds, 

 magnetician and surgeon, and second in command; H. F. Johnston, 

 I.A.Luke, and H. E. Sawyer (who joined the vessel atColon), observers; 

 N. Meisenhelter, meteorological observer and clerk; R. P. Doran, first 

 watch officer; M. G. R. Savary, engineer; second and third watch 

 officers, and 1 mechanic, 8 seamen, 2 cooks, and 2 cabin boys; 23 persons 

 in all. In addition, Dr. S. J. Mauchly remained with the vessel until 

 Panama was reached, to perfect the installation and operation of the 

 newly constructed atmospheric-electric instruments. The passage to 

 Colon was made in 15 days, during which observations of at least one 

 magnetic element and usually of all three were made on every day of the 

 stormy passage. Two deaths from sickness occurred during this 

 passage, namely, A. H. Sorensen, cook, March 11, and W. Stevens, 

 cabin boy, March 24. The ship instruments were compared with the 

 land instruments and a new repeat station was established. Unfortu- 

 nately the previously occupied stations in the vicinity of Colon are now 

 magnetically affected by the large construction operations. On April 4 

 the Carnegie dragged both anchors in a fierce norther, but finally the 

 anchors held. She was subsequently towed to a pier by the tug Porto 

 Bella and the dredge Caribbean. 



The Carnegie was next taken through the canal and then she set sail in 

 the Pacific Ocean on April 12 from Balboa, bound for Honolulu. After 

 39 days at sea, during which 73 determinations were made of the 

 magnetic declination and 39 each of dip and intensity, including a 

 swing of the ship, the Carnegie reported her arrival at Honolulu on 

 May 21. An elaborate scheme of comparisons was carried out between 



