Extracts from Instructions, 1909-16 323 



CRUISE III OF THE CARNEGIE, 1914. 



From Instructions of June 1, 1914, to J. P. Ault, at Brooklyn. 



The following are your final instructions regarding route and work for the North Atlantic Cruise 

 of 1914: 



1. Route. — Leaving Brooklyn, proceed, if everything is found satisfactory, direct to Hammer- 

 fest, Norway, aiming to sail, as far as possible, on a course about midway between the Carnegie's 

 tracks of 1909 and of 1913, and crossing parallel 50° N about in longitude 30° to 25° W. (Should 

 it be found necessary to stop first at Greenport or vicinity, then such observations and swings will 

 be made in Gardiners Bay as conditions permit; however, in view of the work planned at the end 

 of the cruise, there should be as httle delay there as possible.) 



From Hammerfest, a course will be taken for Reykjavik, making as far northerly latitude towards 

 Spitzbergen as safe navigation for the Carnegie may permit. Proceed thence to Greenport, Long 

 Island, aiming to survey, as effectively as possible, the region between parallels 50° and 60° N. 

 From Greenport, the vessel will return to Brooklyn. [The various courses were approximately shown 

 on a map.] 



2. Magnetic Work. — The vessel will be swung, and complete observations will be made at 

 Hammerfest, Reykjavik, and Gardiners Bay, as also the usual shore observations and comparisons. 

 En route to these ports the same program of work as followed on previous cruises will be carried out. 

 The observations will be promptly reduced and mailed as heretofore. An opportunity to swing 

 vessel under excellent conditions, in deep water, should be embraced. 



3. Atmospheric-Electric Work. — The detailed directions suppUed you will be followed as closely 

 as tune and circumstances permit. Special attention will be given to this part of the work in order 

 to make possible desired improvements. 



4. Atmospheric-Refraction Work. — These observations will be continued as heretofore, following 

 the method found best, in accordance with the memoranda suppUed. 



5. Boiling-Point Observations.— In order to give more time for 3, these may be omitted or only 

 made as may be necessary for the control of the aneroids. 



6. Meteorological Work. — These observations, as well as any accompanying ones, will be made as 

 heretofore. * * * 



CRUISE IV OF THE CARNEGIE. 1915-1916. 

 From Route Instructions of February 2, 1915, to J. P. Ault, at Brooklyn. 



1. The route and ports for Cruise IV of the Carnegie, given below, are hereby approved as far 

 as Port Lyttelton, New Zealand, which port is to be reached, if possible, about the middle of October 

 1915. The route to Port Lyttelton is tentatively sketched on the map supphed, it being understood, 

 of course, that any variation as required by conditions encountered will be left wholly to the Com- 

 mander's discretion. 



2. Respecting the question of stopping at Guam on the trip from Dutch Harbor to Port Lyttel- 

 ton, it would appear that considerable delay might ensue when leaving Guam. You may, accord- 

 ingly, omit this port on the southward trip. * * * 



3. For the balance of the cruise, beginning at Port Lyttelton, a chart is being prepared showing 

 the magnetic data at present available in the regions concerned. * * * 



[In his supplementary instructions of Feb. 17, 1915, the Commander was authorized to carry 

 out the circumnavigation of the region between parallels 50° and 60° south, beginning at Lyttelton, 

 proceeding in an easterly direction to South Georgia and thence to Lyttelton. A special account of 

 this part of Cruise IV will be found on pages 326-330. The adopted ports of call for Cruise IV 

 to October 1916, were as follows: Brooklyn, Greenport, Colon, Balboa, Honolulu, Dutch Harbor 

 (Alaska), Lyttelton, South Georgia, Lyttelton, Pago Pago (Samoa), Guam, and San Francisco. 

 See synopsis of cruise on pages 172-176, and abstract of log, pages 350-356.] 



Instructions of February 18, 1915, for Scientific Work on Cruise IV. 

 I. Magnetic Work. — (a) The general program of work under this head will be the same as on 

 previous cruises, the observations, as heretofore, being promptly reduced and mailed to the OflBce 

 of the Department. Specific directions as to instruments will be found with the data giving instru- 

 mental constants. 



