I $ 4 ' Mr. WooDHOusE on the derangement of certain 
October 26. Upper culmination. 
After the star had passed the middle wire I held, for about 
9 minutes, the upper eastern and lower western brace, one 
in each hand. 
Now, 58“ 48“ + lo"* 38’.2 - • 9” 
Observed passage - - 9 44 
Deviation to the west 
17 .8 
October 28th. Upper culmination. 
4th 
Sth 
m. s. 
58 47 
ID. S. 
9 29 
Polaris. 
After the star had passed the middle wire, I held, for about 
9 minutes, the 2 lower braces, one in each hand. 
Computed transit at 
5 tli. 
58“ 47’ + 10” jS'.Z - - •9“ 25’.2 
Observed - . - - 29 
Deviation to the west - - 3.8 
In this case, as in those of pp. 149,152, the expansions of the 
braces counteracted, and nearly balanced, each other, since 
the deviation does not much exceed the error of observation. 
I think I may presume to say, that the foregoing experi¬ 
ments incontrovertibly show that the partial heating of the 
diagonal braces, or the partial heating of any one of the 
braces, deranges my transit instrument; the derangement 
