APRIL 4, 1921 proceedings: philosophical society 165 



(2) There were two principal variations (with some subordinate ones), as 

 shown especially at stations near the totahty-belt, having periods approxi- 

 mately that of the entire eclipse (5h. 10 m.) and that of the local eclipse 

 (on the average about 2 hours from first to last contact) . There are evidences 

 that the efifects continued for some time after the end of the eclipse at sunset 

 on the southeast coast of Africa. The amplitude (semi-range) of the short 

 wave was, on the average, about one-half of that for the long wave. In the 

 case of the magnetic declination, for example, the amplitude of the long 

 wave for stations inside or near the totality-belt approximated, on the average, 

 one minute of arc, which was equivalent to a horizontal deflecting force of 

 about 0.01 per cent that of the average west-east component of the Earth's 

 magnetism. 



(j) A preliminary analysis of the magnetic effects at stations within the 

 region of visibility, or in close proximity, showed that the effects in declination 

 and horizontal intensity were similar to those produced by a north-end at- 

 tracting focus located in the vicinity of the shadow cone. With the aid of 

 the vertical-intensity effects it was found that the eclipse magnetic system 

 was composed of an external and an internal system of forces. 



At 12h. SOm.G.M.T., May 29, 1919, just before the maximum development 

 of the eclipse system, the north end attracting focus of the external system 

 was located east-southeast of the shadow cone, and that of the internal system 

 was to the northward of the cone and approximately northward of the point 

 where the Sun and the Moon were in the zenith. The momentarily increased 

 magnetization of the Earth for stations near the belt of totality of 0.012 per 

 cent at 12h. 30m. corresponded to the amount associated with about a six 

 per cent decrease in solar radiation. Equally interesting results were dis- 

 closed at other times; invariably the positions of the foci of the disturbing 

 forces could be related to the momentary position of the shadow-cone. The 

 indications are that the complete analysis of the eclipse magnetic system will 

 show that it has characteristics analogous to those exhibited by the systems 

 causing the solar-diurnal and the lunar-diurnal variations of the Earth's 

 magnetism. 



839th meeting 



The S39th meeting was held at the Cosmos Club, October 23, 1920. Presi- 

 dent SoSMAN presided and 25 persons were present. The program was as 

 follows : 



William Bowie: The Pan-Pacific Scientific Congress. 



The speaker presented a paper on the recent scientific conference for the 

 exploration of the Pacific which was held under the auspices of the Pan-Pa- 

 cific Union in Honolulu, August 2-20, 1920. In the winter of 1919-20, a 

 committee of the National Research Council, formed to consider the scientific 

 exploration of the Pacific, held several meetings at which the necessary pre- 

 liminary steps were taken and then the activities were transferred to Honolulu 

 where a local committee of scientists perfected arrangements for the conference. 



At the conference were representatives of the United States, Canada, Japan, 

 New Zealand, Australia, the Philippine Islands and Hawaii. 



The organization of the conference was described, and the general resolu- 

 tions and those resolutions bearing on the geographic subjects which were 

 adopted by the conference were explained in some detail. The scientific 



