147 
transit instruments by the effect of temperature. 
Computed transit 
From transit at 1st wire 
26“ 
49' + S 2 " 
54 s - 8 - 
at 6th wire. 
- 1 h 1 9“ 43 5 -8- 
2nd 
37 
29 + 42 
15.6 - 
44 - 6 
3d 
48 
4+3i 
43-i - 
47 -i 
4th 
58 
43>5 + 21 
4.9 - 
48 .4 
Computed mean transit - - - i 19 45 .97 
Observed transit - - - - - 1 19 27 
Excess of computed above observed transit - - - 18.97 
This acceleration of 18 s . 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. 
1 
2 
3 
4 
5 
Polaris. 
m. 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. 
Computed transit 
at 5 th 
From transit at 1st 
27“ 6 3 
4- 4z ra 
22 8 .5 - - 
i h 9 m 28\5 
2nd 
37 45 
+ 3i 
43-i - - 
28 . 1 
3d 
48 23 
-f- 21 
6 -9 * - 
29.9 
4th 
S 8 5 2 
4- 10 
Cxi 
00 
1 
1 
30 .2 
Computed mean transit at 5th wire - - - 19 29 • > 7 3 
Observed transit - - - - - 1 9 47 
1 7 .827 
17 s . 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. 
