102 MEMOIRS OF THE NATIONAL AOAUEMY OF SCIENCES. 



The seams of the tent were phiiiily visible during the totality; they were 20 inches apart and 

 ran exactly north and south. 



Carpenter's Mate Charles Emms, of the Hartford, stood near the tent and compared the dis- 

 tance between the centers of two adjacent diifraction-bands with the distance between the seams 

 and with a foot-rule which he held in his hands. He estimated this distance before totality to be 

 12 indies, and after totality to be IS inches. I have great confidence that the truth lies between 

 these limits. He also estimated the number of bands passing a given line per minute to be SO. 

 From my recollection of the same plieiunuenon in 1878, I should think this estimated number too 

 small. The shadows or bauds lasted about one and one-quarter minutes, both before and after 

 totality. 



While Emms. was observing the distance apart of the bands. Carpenter Peter Murphy, of 

 the Hartford, observed their direction. This he did by laying a 10-foot pole on the tent in a 

 direction perpendicular to the bands. After he was satisfied with the direction of the pole he marked 

 its position on the tent with a pencil. To avoid mistakes the observations before totality were 

 made on the south side of the tent, and those after on the north side. 



After the total phase bad passed I laid out an east and west line on the tent and compared 

 the directions of the i^rogress of the shadows with this. 



Before totality the shadows moved along a line whose azimuth was north 60° east. 



After totality the shadows moved along a line whose azimuth was 92° northwest. 



The general direction of motion was west to east before totality and east to west after totality. 



The radius of the moon's shadow was about G9 miles. The (observed) direction of motion of 

 the bands before totality was about 16^° to the east of the direction of that radius of the moon's 

 shadow which passed through Caroline Island at second contact. 



The (observed) direction of the bands after totality was only 2° to the west of the radius of 

 the moon's shadow which passed through Caroline Island at third contact. It is possible that the 

 first observations are erroneous by 16°, but I do not regard it as probable. 



The other scientific work of the expedition is detailed in the following reports. 

 I am, my dear Professor Young, very sincerely yours, 



EDWARD S. HOLDEN. 



(b). RFA'OBT OF PliOF C. S. HASTINGS. 



Prof. E. S. HoLDEN : 



Dear Sir: The late date at which it was definitively determined that the writer should be a 

 member of the Eclipse Expedition rendered the preparation of the apparatus a laborious as well 

 as a most hurried one. The task would, however, have been far more difficult had not the trust- 

 ees of the Johns Hopkins University generouslj' placed all the facilities of the jihysical laboratory 

 and the services of the university mechanic at my command. Fortunately much useful apparatus 

 was already in my own possession. This, with that lent either by the university or by Mr. Rockwell, 

 one of the members of the party, was all that could be successfully used by the five observers 

 assigned to my instructions. The following is the list of apparatus used, with the essential 

 constants: 



APPARATUS. 



1. rolariscope. — This was the same instrument which the writer used at Central City in 

 1878 ; it is fully described in the report on that eclipse published by the United States Naval 

 Observatory. Time did not admit of trying the instrument or even of adapting it to its 



