104 EEPORT OF THE SECRETARY. 



Nevertheless it was found that no "drift" or "wiggle" was noticed when the glass 

 plate in front of the bolometer case was removed. Accordingly there was no plate 

 in front of the bolometer at the time of the eclipse, and of course none was interposed 

 during the ( )1 jservation just recorded. 



The expedition was strengthened by the presence of Professor Hale, of Yerkes 

 Observatory, who used a second beam from the 18-incli coelostat mirror, also driven 

 by the great siderostat, in connection with Ixjlometric apparatus for the purjiose of 

 observing if a difference in radiation could be detected between the t:oronal lifts and 

 streamers. 



(c) Apparatus for visual observations. Four visual telescopes were employed for 

 observing the coronal structure and the times of contact. These were: 



A 5-inch of about 6 feet focus (shown in Plate XIII), loaned by the United States 

 Naval Observatory, having an equatorial stand and clock. 



A 6-inch of 7h feet focus with e(|uatorial stand, but no clock. 



A Sj-inch of 3J feet focus witli rough alt-azimuth stand. 



A Coast Survey meridian transit instrument of about 2J inches aperture and 2^ feet 

 focus used as an alt-azimuth telescope to observe contacts. 



THE PERSONNEL OP THE EXPEDITION. 



The Director, Mr. S. P. Langley, Secretary of the Smithsonian Institution, observed 

 with the 5-inch equatorial; and the other members of the expedition were assigned 

 as follows: 



Mr. C. G. Abbot, aid acting in charge, witli Mr. C. E. Mendenliall to the bolo- 

 metric a])paratu8. 



Mr. T. W. Smillie, photographer of the National Museum (iu general charge of 

 photography, including the development of all i)lates), specially to the direct 135- 

 foot focus camera. 



Mr. F. E. Fowle, jr., junior assistant, to the 38-foot focus camera. 



Mr. G. R. Putnam (detailed from the United States Coast and Geodetic Survey) 

 to the determination of latitude and longitude, the observation of times of contact, 

 and the direction of signals. 



The Rev. Father Searle, C. S. P., together with Mr. Paul A. Draper and Mr. C. AV. B. 

 Smith, to the combination of four wide field cameras. 



Mr. De Lancey Gill to the 6-inch photographic telescope and the objective prism. 



Mr. R. C. Child to the 6-inch visual telescope, the electrical circuits of the chrono- 

 graph, the prismatic camera, and the contact camera. 



The Rev. Father Woodman, C. S. P., to the 35-inch telescope. 



Mr. A. Kramer, instrument maker, to the movements of the siderostat and 5-inch 

 equatorial. . 



Besides these there volunteered for the day of the eclipse Mr. Little, of "Wadesboro, 

 and ]Mr. Hoxie, assigned, respectively, to strike signals and to record contacts for Mr. 

 Putnam. 



Prof. George E. Hale was connected, as already said, with the Smithsonian party, 

 while at the same time in general charge of the Yerkes Observatory exi:)edition, whose 

 camp adjoined ours. 



THE EXPEDITION. 



After the preparation of the apparatus and the preliminarj^ rehearsal for the ecliiise 

 on the Smithsonian grounds, a freight car was completely filled with the apparatus, 

 and left Washington May 2. 



The first four members of the expedition, Messrs. Abbot, Fowle, Kramer, and 

 Smith, left Washington May 3, and were followed in a few days l^y two more, Messrs. 

 Putnam and Draper, the former of whom, however, returned after determining the 

 latitude and longitude and helping to adjust several jwlar axes. Messrs. Smillie, 

 Mendenhall, Child, and Gill reached Wadesboro May 16, and the other members of 

 the party arrived about two days before the time of the eclipse. Pleasant accommo- 



