transit instruments by the effect of temperature. 147 
Computed transit 
From transit at 1st wire 
1 
26” 
49 ’ + S2” 
54^.8 - 
at 6tii wire. 
- l**19'a 43-8- 
2nd 
37 
29 + 42 
15.6 . 
44 -6 
3d 
48 
4+31 
43-1 - 
47 ,i 
4th 
00 
43,5+ 21 
4.9 - 
48 .4 
Computed mean transit - - - i 19 45 .97 
Observed transit - - - - - i 19 27 
Excess of computed above observed transit - - - 18.97 
This acceleration of 18^.97 in the passage of Polaris indi¬ 
cates, since the culmination was an inferior one, a deviation 
of the telescope to the west, which the expansions of the 
upper eastern and lower western brace are both disposed 
to produce. 
October 17. Upper culmination. 
I 
2 
3 
4 
5 
Polaris. 
rn. s. 
27 6 
ni. s. 
37 45 
m, s. 
48 23 
m* s. 
58 52 
m. s, 
9 47 
After the star had passed the middle wire a warmed 
blanket was applied to the same braces as before. 
From transit at ist 27“ 6^ 
2nd 37 45 
3d 48 23 
4th 58 52 
Computed transit 
at . 5 th 
+ 42'" 
22».5 - - 
I** 9"’ 28^.5 
+ 31 
43.1 - - 
28.1 
+ 21 
6 .9 - - 
29.9 
10 
38 .2 - - 
30 .2 
Computed mean transit at 5th wire - - - 1 9 29.173 
Observed transit - - - - - i 9 47 
17 .827 
i 7\827 is then the retardation of the passage of the star, 
indicating, since the culmination was a superior one, a devia¬ 
tion of the telescope to the west, as in the preceding ex¬ 
periment. 
