326 C. A. Young—Displacement of lines in the 
of two or three divisions, and they are therefore omitted, 
The 
readings of the nickel line are retained, though far less reliable 
than those of the two Ds. 
(1.) July 10, 1876; 9.80 to 10.15 a.m. (civil time); grating 
right; spectrum of 6th order; definition poor. 
West. Mean. | ‘East. 
ae a ete 6 
Dp; 4 45°65 | 284°70 | 4 43°75 1°90 Pecaiitc:. 
Ni | 3 52:90 
| 3 49°75 | 2:15 ||U=3°55 
D, | 2 59°00 | 178°05 | 2 57-10! 1-90 
A=106°65 =1°98 
If we reject the nickel line 6’=1-90, “=0-0178 
and U’=3 83. 
(2.) July 10; 10.30 to 11.10 a.m. D lines; grating right; 
spectrum of 6th order; definition medium. 
West. Mean. East. 
Tr d d 
D, 4 26°40 | 265°57 
Ni | 3 32°05 3 29°65 | 2°40 
iis 3 39°95 158°97 3 38°00! 1°95 iU=3°57 
© o-0187 
A 
r d d 
4 24°75 | 1°65 
d 
A=1096°60 d=2°00 
Rejecting the nickel line, 6’=1-80 ; © = 0.0169. U'=3 22. 
(3.) July 10: 11.85 to 12.00 a.m. D lines; grating eft; 
spectrum 6th order; definition fine. 
West. Mean. East. 
r d i; d d 6 016 
D, | 4 13°50} 253-87 s 14°25 | 0-75 | =eORe 
Ni | 4 51°00 bs 51°82 | 0°82 as 
D,'5 16°87| 31728 |5 17°70| 0°83 | U=2 
A=63°41 =0°80 
(4.) July 15; 10.15 to 10.40 a.m. Observation ina 
by clouds when half completed. D lines; grating 717 1; spec 
trum 6th order ;. definition poor. 
West. Mean. East. | : ‘| 3 
by d d r d d : 
D, | 5 ted 30815 | 5 07:90 | 0-50 ||=0°0061 
Ni | 4 12-70: 4 12°00 | 0°70 reer i 
D,!3 22-05 | 201°67 | 3 21:30! 0-75 is abies we 
A= 106°48 60°65 to little weight. 
Seg eee : um- 
(5.) August 10; 9.80 to 10.40 a.m. Twice the ant th 
ber of readings taken. D lines; grating lef; spec 
order; definition excellent. 
