Instructions for the Galilee Work 125 



second station in the vicinity of the primary one, say not less than 30 feet away, and placed in the 

 direction of one of the azimuth marks, azimuth of which has been or can readily be determined by 

 angular measurements. It will thus be possible for two persons to observe at the same time; by 

 exchanging stations, data will be obtained for reducing the respective observations to the same 

 station. 



3. The principal tests of the instruments will be made at the German Meteorological and Mag- 

 netic Observatory, Apia, Samoa, at the Tokio Central Meteorological and Magnetic Observatory, 

 also possibly at Sitka Magnetic Observatory. By conference with the respective directors, you will 

 be able to decide mutually on the precise manner in which the desired tests and intercomparisons 

 are to be made. At these, as also at other stations, opportunity will be afforded for the rating of 

 chronometers, and for the requisite standardizing of any of your meteorological instruments. 



4. There are inclosed 23 sheets giving information regarding previous stations and observations 

 at points along a portion of the route of the coming cruise. No definite instructions can be given as 

 to which of these stations it will be feasible to occupy, and this matter will have to be left to the 

 commander's judgment. * * * 



CRUISE III OF THE GALILEE. 1906-1908. 



W. J, Peters in Command. 



From Route Instructions of November 22, 1906, to W. J. Peters, Washington, D. C. 



1. As soon as possible after December 1 next, you will please carry out the following cruise: 

 San Diego, California, by du-ect course to Nukuhiva (Marquesas Islands), thence to Tahiti, next 

 to Apia, from which port shape a course for Yap, intermediate between that of second cruise and 

 Solomon Islands. From Yap, proceed to Shanghai by direct course, thence to Hongkong. 



[From Shanghai the Galilee proceeded to Sitka. Head-winds prevented making Midway with- 

 out considerable loss of time. Near the one hundred and eightieth meridian the course was shaped 

 for Sitka on account of the approaching end of the season. Declinations were possible only on 8 days 

 between Shanghai and Sitka, owing to continued cloudy weather. The route from Sitka, according 

 to supplementary instructions of August 3, 1907, prepared at Sitka, is sufficiently indicated by the 

 ports of call— Honolulu, Jaluit, Christchurch, Callao, San Francisco. See also abstracts of logs.] 



Directions of November 30, 1906, for Swing Observations, to W. J. Peters, San Diego. 



1. When everything is finally in place on board as at sea, swing ship on 8 equidistant points 

 (both helms) shortly before leaving San Diego, observing as follows: 



A. Declination observations with the new Ritchie compass 29499 (R3C) and new azimuth 

 circle 481, using both prism and alidade, and observing preferably on the Sun. 



B. Horizontal intensity observations with sea deflector 1, using magnet 45, short distance, 

 letters up on first helm, and same magnet, letters down, on other helm. (From these observa- 

 tions are secured Ukewise, as before, the declination deviations for the Negus compass.) 



C. Inchnation and total intensity with sea dip-circle 35. On first helm throughout, loaded- 

 dip observations, complete set on each point as heretofore; on the other helm, deflection ob- 

 servations, long distance, face of suspended needle "direct" throughout, and set complete on 

 each point same as hitherto. [Supplemented December 10, 1906, as follows: In swings, alter- 

 nate dip circles 35 and 169, i. e., if for one swing No. 35 has been used then for next swing use 

 No. 169. In both cases, however, make deflections only with long distance.] 



D. Should there be opportunity during the swing, it would be very desirable for someone to 

 try observing the time of vibration of the new Kelvin card No. 8127 on as many headings as 

 possible. (It is desired on this cruise to ascertain definitely whether vibrations are feasible.) 



2. All other swings, whether in port or at sea, will be precisely the same as the San Diego ones, 

 excepting as pertains to C, first part, viz, if loaded-dip observations were secured on first helm, then 

 for next helm make, instead, regular-dip observations with the best dip needle on hand, keeping same 

 polarity throughout. Furthermore, helms should be alternated; thus, if on port-helm swing the 

 observations consisted of loaded dip (or regular dip), and on starboard-helm swing deflections were 

 made, then next time make the latter observations on port-helm swing, and the former on starboard- 

 helm swing, etc. 



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