166 
Captain Kater's description of 
2 1 St Set. 
Divisions 
of 
Microm. 
Difference. 
Error in Sec*, 
affecting the 
Horiz. point. 
Dec. 30 
A. M. 
Out and replaced, S first - 
Ditto - ditto - - 
Ditto - ditto - 
Ditto - ditto - - 
Ditto - ditto - 
Ditto - ditto - - 
25.1 
24.1 
24,8 
20,6 
23.1 
21,6 
— 1,0 
+ 0,7 
— 4,2 
+ 2,5 
— D 5 
// 
— 0,30 
4- 0,21 
— 1,26 
+ 0,75 
■ —0,45 
22d Set. 
Jan. I 
Out and replaced, S first - 
Ditto - ditto - - 
Ditto - ditto - - 
Ditto - ditto - 
Ditto - ditto - ~ 
Ditto - ditto — 
19>4 
21,9 
21,4 
23>5 
21,9 
— S >5 
+ 2,5 
— 0,5 
+ 2,1 
— 1,6 
— '1,65 
+ o »75 
— 0,15 
+ 0,63 
— 0,48 
Having caused the long float to be ground smooth, and 
browned it by rusting it with nitric acid, and rubbing it with 
oil, the oil was very thoroughly cleaned off, and the follow- 
ing experiments made with the greatest care. 
4 
Long float browned. 
23d Set. 
L 
Jan. 2 
Out and replaced, S first - ' - 
Ditto - ditto - 
Ditto - ditto - - 
Ditto — ditto - 
Ditto - ditto - - 
Ditto - ditto 
1 . 
2,7 
2,1 
3^4 
3>3 
S >7 
+ 1.3 
— 0,6 
+ D 3 
— 0,1 
+ 2,4 
+ o »39 
' — 0, 1 8 
+ 0,39 
0,03 
+ 0,72 
I 
