REPORT OF COMMITTEE ON OBSERVATORIES 87 



Monday, June 22. — The sun was examined from 6.30 to 7. 15 a. m. , 

 and the seeing was found to be poor. A pretty strong west wind 

 was blowing. During the forenoon the sky clouded and it remained 

 cloudy until late in the afternoon. Unquestionably a storm con- 

 dition prevailed during the day, and no doubt its effects lasted into 

 the night. 



From 8 to 10 p. m. the seeing was fair, about 3. The stellar 

 images were small and distinct, but with considerable motion and 

 more or less continual breaking of the diffraction pattern. A strong 

 northeast wind, perhaps 20 miles an hour, was blowing during the 

 night. 



Tuesday, June 23. — From 3 a. m. to 4.15 — i. e., dawn — the stellar 

 images were much better than in the earlier portion of the night. 

 The central disc of the image was small, distinct, and sharply de- 

 fined, and the diffraction pattern was much more satisfactory. 



Very early in the morning the wind went down almost completely, 

 and when the sun was first examined, from 7 to 7.20 a. m., the 

 image was found to be excellent. The granulations of the surface 

 and the structure of the spots were very clearly defined and almost 

 wholly free from blurring. 



By 10.30 a. m. the seeing had gone to pieces. While the image 

 was occasionally clear and distinct, this was by no means the nor- 

 mal condition. On the contrary, it was during the greater part of 

 the time more or less completely blurred. 



Between 11 and 12.10 the seeing was considerably improved. 

 There were intervals when the definition was good, but longer 

 periods when it was poor, and occasionally the blurring was bad. 



Between 2 and 3 o'clock the seeing was poor. It clouded up 

 about the middle of the afternoon and remained cloudy until shortly 

 after dark. It then became beautifully clear. During the night 

 there was a strong wind from the northwest. 



Wednesday, June 24.. — Early in the morning, 6 to 7.30, the seeing 

 was not very good, nor was it very bad. There was more or less 

 constant haziness without pronounced blurring. Much detail could 

 be seen, but not very satisfactorily. It did not have the steel plate 

 effect of the finest definition. From 9.30 to 11.45 the seeing was 

 poor. In the afternoon it was fair between 4 and 5 o'clock and 

 somewhat worse during the next hour. 



In the evening, from 8 to 10.30, the seeing was good — 3 to 4. 

 This was also the case during the latter part of the night — i. e. , 

 from 3 to 4.15 a. m. 



