153 
transit instruments by the effect of temperature. 
Computed passage 
at . 5 th. 
1st 58"*48’ 4- 10™ 38“.2 - - - 9"" 26*.2 
Observed passage - - - 916 
Deviation to the east - - 10 .2 
Next, at 7th. 
I9'“58’ + 10"* 39".2 - - - 30™ 37’,2 
Observed passage - - - 30 56 
Deviation to the west - - - 18 .8 
Oct. 25. Lower culmination. 
ID. S. 
ru. s. 
ID. S. 
m. s. 
58 40 
00 
Os 
1 
19 48 
30 27 
p 
S. P. 
After the star had passed the middle wire, the shutters to 
the south were unclosed, and the sun was suffered to shine 
on the lower western brace alone, which it began to do, but 
feebly and interruptedly, * after the star had passed the 5th 
wire. 
computed transits at 
6th 
7 th 
S*- 4 °-+ - - 
19” 44’.9 
30“ 24*.3 
9 «+ {44.11 • - 
44 -2 
23.6 
Observed - . . - 
19 44.55 
48 
30 23.95 
27 
Deviation to the west 
3-45 
3 -OS 
* During the observations of Polaris, the sky at the upper culminations, was 
generally clear; at the lower, almost always cloudy to the south, so that I was 
unable to expose, which I was desirous of doing, first, one brace, and then two 
braces on the same side to the sun’s rays. It is not now worth the while to keep 
the braces on the instrument another half year for the chance of trying this expe¬ 
riment, especially since an English sky may again frustrate my plans. 
X 
MDCCCXXVII. 
