208 Reports on Special Researches 



Arriving at Colombo, Cej^lon, on June 21, I found the Carnegie awaiting me. Sailing with 

 her on July 0, Port Louis, Mauritius, was reached on August 1, a successful series of mag- 

 netic observations having been secured on the entire trip. While aboard I inspected the 

 ocean work, carried out some additional experiments, and gave the requisite supplementary 

 instructions to Mr. W. J. Peters, in command of the vessel. The route to Mauritius was 

 also arranged so as to secure intersections with the tracks of the German Antarctic ship of 

 1902-1903, the Gauss. 



At Port Louis, the Royal Alfred Observatory at Pamplemousses was visited and a 

 cooperative arrangement entered into with the Governor of Mauritius whereby the observa- 

 tory magnetic work could continue to be made promptly available to the Department 

 of Terrestrial Magnetism in return for a new vertical-intensity variometer and earth induc- 

 tor supplied by the Department. In this connection I also made a partial investigation of 

 the pronounced local magnetic disturbances existing on the island of Mauritius and beyond, 

 as disclosed by our sea observations.^ 



The Carnegie was ready to sail again on August 16, and on the return trip to Colombo 

 the route was extended sufficiently into the Bay of Bengal to fix the position of the agonic 

 line. A report was prepared on the large errors found in the existing magnetic charts of 

 the Indian Ocean, and the large secular changes in this region were pointed out.^ 



Arriving at Colombo on September 10, 1 gave final instructions to Mr. Peters respecting 

 the ocean magnetic work, and then left on the 11th for Bombay, visiting en route (Septem- 

 ber 12-13) the magnetic observatory at Kodaikanal, Southern India, as also (September IG) 

 the old magnetic observatory at Madi'as. Bombay was reached on the 18th, and in the 

 afternoon a visit was paid the Government Meteorological and Magnetic Observatory at 

 Colabd, in charge of Professor N. A. F. Moos. September 19 to 21, I visited, in company 

 with Professor Moos, his well-equipped new observatory at Alibag, and made there a few com- 

 parison observations, using my magnetometer No. 14; the results of these observations will 

 be foundgivenonpages219-221 of this volume. Wereturned to Bombay Thursday afternoon, 

 the 21st, and on the following two days I conferred with Professor Moos at Bombay regard- 

 ing various matters. Leaving on the afternoon of September 23, I arrived on the morning 

 of the 27th at Delu-a Dun, in Northern India, the chief station of the Magnetic Survey of 

 India, and proceeded the next day to the summer office of the Survey on the mountain at 

 Mussoorie. Here I conferred regarding magnetic matters with Colonel Burrard, who had 

 just been appointed Surveyor General of India, and with Captain Thomas, then in charge 

 of the magnetic-survey party. I returned to Dehra Dun on the following day, September 

 30, made two sets of magnetic observations at the Dehra Dun Magnetic Observatory, 

 leaving 9 p. m. for Calcutta, which I reached on October 3. Considerable difficulty, on 

 account of excessive moisture, is encountered at the underground magnetic observatories, 

 Kodaikanal and Dehra Dun. 



On October 4 the Barrakpore Magnetic Observatory, near Calcutta, was visited, and 

 on the 5th the Alipore Meteorological Observatory. I left Calcutta on the 6th for Batavia, 

 via Rangoon and Singapore, visiting en route (October 10-11) the Magnetic Observatory at 

 Toungoo, Burma. At Singapore, October 17, I inspected the various sites where magnetic 

 observations had been made previously, and finally arrived at Batavia on October 22. 



October 23 the Batavia Magnetic and Meteorological Observatory was visited and 

 on the next day I proceeded witli Dr. van Benmielen, the director, to the new magnetic 

 observatory at Buitenzorg. Having given Mr. Peters the requisite directions regarding the 

 shore work and comparisons at the Batavia Observatory, I was able to leave Batavia on 

 the 29th, and arrived at Hongkong on November 7. After visiting the Observatory here, 

 I departed in the afternoon for Canton, where, in the absence of Dr. Edmunds, a conference 



'The preliminary report on this subject was published in Terr. Mag., vol. 16, 1911, p. 243. 

 -Published in Terr. Mag., vol. 10, 1911, p. 133. 



