284 C. A. Young—The Solar Eclipse. 
grating and ee the galvanometer, while Mr. Taylor, 
enver, who joined us for the day, directed the ihanioe 
Doubtful fiitiestioris were obtained of a heat line having a 
wave length of about 8540 of Angstrém’s scale. 
Of the instruments described the large pa heer was 
mounted under a sort of railroad car, which could be ru 
on a track so as to uncover the telescope when wanted. The 
photographic telescope and Professor Brackett’s instrument were 
in a separate house, which also contained the photographic 
dark room, the telegraphic apparatus and chronometers. The 
other instruments were so arranged that they could be easily 
dismounted and brought under shelter when necessar 
The weather was very unsatisfactory for most of the time 
between our arrival upon the ground and the eclipse, especially 
for the ten days immediately preceding. The mornings were 
ads generally clear, but by eleven o’clock the sky would be 
ess completely overcast with heavy cumuli rolling 
ret from the mountains, and in the afternoon there would 
be thunderstorms, sometimes of great violence. But the da 
of the eclipse was almost perfect; there were no clouds except 
one or two little fleecy things which kept out of our way, and 
a heavy bank over Long’s peak, just where it was wanted to 
bring out the effects of the Pet shadow. 
Observations of Contacts, ete. 
The first contact was noted by Professor Brackett with the 
four-inch telescope at 2" 19™ 43°83, local time. By myself, 
with the spectroscope attached to the three-inch finder of the 
equatorial, the moon was first certainly made out encroaching 
upon romosphere at 25 19™ 388%, and acme with the 
limb was noted at 2" 19” 465-0, both local tim 
Professor kwood with the four-inch dinky te, “gua 100, 
noted the first contact as having occurred—a past event—at 
2" 20™ O7*8, local time. He remarks, “I was sneallnstee that 
this was too late by certainly several seconds.” The instru- 
ment was not provided with a convenient means of marking the 
place of contact, which occurred at a point not exactly where 
it was expected. No observations were made of second and 
3 contact. nee last contact was noted by Professor Brackett 
4" 35™ 10°7 ; by Professor Rockwood at 4% 84™ 53°8; by 
fe wait with the nine and a half-inch telescope, full apertare 
polarizing eye-piece and power of 250, at 4" 85™ 14*°5—a v 
ap ere observation 
It will be temees Grad that the error of the standard chro- 
nometer was determined by sextant observations upon the sun, 
and the time is therefore uncertain to the extent of at 
least 1°5 seconds from this cause. 
