324 Ocean Magnetic Observations, 1905-10 



(6) In view of the new conditions, caused by the recent etructural work and alterations of 

 vessel and bj' the installations of the atmospheric-electric instruments within close proximity to the 

 mounts for the magnetic instruments, it will be highly desirable to swing vessel and make complete 

 observations as often as conditions may permit, in order to make certain the absence of deviation- 

 corrections. During these swings, the atmospheric-electric instruments are to be in place, and in 

 operation, just as when the regular observations with these instruments are made. It may suffice, 

 for the present year (1915), to make these swings at Gardiners Bay, Colon (or Panama), Honolulu, 

 Dutch Harbor, and Port Lyttelton. In view of the possibility of local disturbance at some of these 

 ports, especially Honolulu, and perhaps also Dutch Harbor, it will be desirable to make some swings 

 also at sea. The aim should be to get as large a range in magnetic latitude as possible. 



(c) The shore observations at Gardiners Bay may be omitted. The shore work at Colon 

 (or Panama) may be restricted to the absolutely essential observations and comparisons. At 

 Honolulu, where a longer stop is contemplated, the shore observations and comparisons of instru- 

 ments will be made according to the complete scheme for such work. Here also comparisons wall be 

 obtained with the magnetic standards of the Honolulu Magnetic Observatory. The shore observa- 

 tions and comparisons at Dutch Harbor, in view of the high magnetic latitude, should be made as 

 complete as conditions will permit. Similar observations on arrival of the vessel at Port Lyttelton 

 will be made at the Christchurch Magnetic Observatory, and an intercomparison of standards will 

 be secured. Information regarding the shore stations and the places where the Galilee was swung at 

 Honolulu and Port Lyttelton is supplied on separate sheets. 



II. Atmospheric-Electric Work. — (a) The detailed directions supplied for observations under 

 this head will be followed.' With the addition of another observer to the vessel's scientific staff, 

 it will now be possible to assign one observer practically entirely to the atmospheric-electric work. 

 However, in order to secure simultaneity of determination of the various electric elements, it will be 

 necessary to have also an auxihary observer take part in this work. The principal observer, in return, 

 will have to render any assistance required in the successful execution of the other work of the 

 Carnegie. * * * 



III. Atmospheric-Refraction Work. — The observations will be made in accordance with the 

 detailed directions supplied.' It is hoped that special attention will be paid to these observations, 

 in order to secure desired improvement. * * * 



IV. Barometer and Boiling-Poiyit Work. — See detailed directions.' 

 V. Meteorological Observations. — See detailed directions.' 

 IV. Astronomical Observations — See detailed directions ' 

 VII. The assignment of each obser\'er's specific duties is left to the Commander's discretion. 



'The detailed directions are described in the special reports dealing with the various kinds of work. For those pertaining 

 to the atmospheric-electric work, see pages 376-397. 



