152 Mr. Woodhouse on the derangements of certain 
In this case the deviation of the transit was to the west, 
and if we suppose equal communications of heat to have been 
given, by the above mode, to the two braces, it will follow, 
on the grounds of my explanation, that the lower western 
brace has more effect in deranging the instrument than the 
upper. 
But that in the above experiment the two braces counter- 
acted each other, will be understood from the latter part of 
the observation. After the star had passed the 6th wire, I 
held, in one hand, for about 9 minutes, the lower western 
brace, 
Computed passage at 7th wire. 
Now 58"" 48 s + 3i ra 49*. 9 - - 3o ra 37 s . 9 
Observed passage - - - 30 56 
Excess of observed above computed 18 .9 
In this case the effect produced by warming one brace was 
three times that produced by warming the two braces on the 
same side. 
Oct. 25. Upper culmination. 
4 
5 
6 
7 
Polaris. 
m. s. 
58 48 
m. s. 
9 16 
ID, S. 
*9 58 
111 . S. 
30 56 
After the star had passed the middle wire, the lower 
eastern brace was held in my hand nearly 9 minutes ; and 
after the star had passed the 6th wire the upper eastern brace 
was held for about the same time. 
