158 
Captain Kater's description of 
Experiments with the Iron Float. 
3d Set. 
Divisions 
of 
Microm. 
Difference. 
irror in Sec®, 
affecting the 
Horiz. point. 
Dec. 9 
Previously to moving 
3 raised _ - - - 
57>7 
5 L 5 
^Jot sufficient mercury ; added more. 
Out and replaced S first 
□ raised and carried 
3 raised and carried, escaped from the \ 
grooves ~ ~ i 
Out and replaced, the surface at once in } 
contact * * ■ i 
Out and replaced, O first - 
Out and replaced, E first 
Out and replaced, S first 
Out and wiped the mercury, S first 
Out and replaced, E first 
Out and replaced, S first 
Out and carried, S first 
Out and Wiped, S first 
47 >i 
43^3 
44>3 
46,6 
46,5 
44.2 
43>8 
43.1 
42.1 
4 L 9 
37>5 
37.4 
— 3>8 
+ 1,0 
+ 2,3 
— 0,1 
— 2,3 
— 0,4 
— 0,7 
— 1,0 
— 0,2 
— 4>4 
— 0,1 
// 
— 1,14 
+ 0,30 
+ 0,69 
+ 0,03 
— 0,69 
— 0,12 
0,21 
— 0,30 
0,06 
1,32 
— 0,03^ 
On returning after an hour’s interval 
Out and carried, S first 
Out and carried, S first 
Out and carried, S first 
Out and carried, S first _ . . 
0 raised and carried 
Agitated by raising and depressing the 7 
end of the box - * j 
Out and carried, S first 
42,4 
4°>7 
42,7 
43 A 
42,1 
39A 
No Var 
38,0 
- h7 
+ 2,0 
+ 0,4 
— 1,0 
- 3.0 
— 1,1 
0,51 
4- 0,60 
+ 0,12 
— 0,30 
0,90 
— 0,33 
Left the lanthorn close to the wires for | 
three quarters of an hour and returned ^ 
Out and agitated mercury, S first 
0 raised and carried 
Out and wiped mercury, S first 
39>3 
38,6 
41.3 
39 A 
— 0,7 
+ 2,7 
— 2,2 
— 0,21 
+ 0,81 
— 0,66 
Lanthorn taken away and returned in an 7 
hour and a half _ _ j 
Lanthorn left close to the wires, returned 1 
in an hour - - - J 
45 >0 
50,8 
Agitated by tapping the box 
51,6 
Returned in an hour 
Out and wiped mercury, S first 
No Var. 
55>8 
+ 4»2 
+ 1,26 
