284 FROST— OBSERVATIONS OF THE ECLIPSE. 



and a six-inch objective of sixty-two-feet focus, with the exposures 

 by Miss Mary R. Calvert, who had her station in the dark room ; 

 (2) with the twelve-inch Kenw^ood equatorial of this observatory, 

 operated by Professor Barnard, with several smaller cameras at- 

 tached to the tube. Professor Barnard makes the following com- 

 ment on the apparent connection of some of the coronal streamers 

 with prominences : 



" Apparent Connection of Some of the Coronal Streamers 

 WITH Prominences. 



" Perhaps no photographs of a previous eclipse have shown with 

 such beauty and distinctness the succession of expanding arches 

 that must have extended above some of the prominences like great 

 spreading envelopes. This is strikingly shown by a large coronal 

 form, made up of numerous arches that seem to center about the 

 remarkable " skeleton " prominence, the position angle of whose base 

 is 253°. A similar but smaller form and arches are centered about 

 a small prominence in position angle 206°. There are other cases, 

 but the arches are not so well developed. 



" The intimate connection of some of the coronal streamers with 

 some of the prominences is best shown by a small prominence in 

 position angle 234°, from which a coronal streamer apparently 

 emanates and in which it seems to have its actual origin. Close to 

 this, to the west, is a long, low-lying prominence, in position angle 

 240°, in which similar coronal streams seem to have their origin. 

 Originating apparently in a projection in the southerly part of this 

 prominence, a broad stream bends westward over the entire promi- 

 nence. From the great prominence in position angle 298° there 

 are strips of matter apparently streaming southward toward the 

 equator, as if impelled by some directing force. 



" On account of the large scale on which they are taken, these 

 features are shown to good advantage on the photographs with the 

 6i>2-foot coelostat." 



It had been my hope that we could apply to the problem of the 

 rotation of the corona the method of the interferometer so success- 

 fully used by Messrs. Fabry, Buisson and Bourget in photographing 

 interference fringes in the Orion nebula (Astrophysical Journal, 



