l6o 
Captain Kater's description of 
Experiments with the Iron Float. 
- - 7 —' ■ 
7th Set. 
Divisions 
of 
Microm. 
Difference. 
Error in Sec*, 
affecting the 
Horiz. point. 
Dec. 1 1 
Out and replaced, S first 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
12,4 
15,8 
16.7 
10.7 
15.8 
— 4>9 
+ 3.4 
+ 0,9 
— 6,0 
+ 
// 
— i >47 
+ 1»02 
+ 0,27 
— 1,80 
+ 1.53 
Experiments to show the effect of turning the box round. 
8th Set. 
Previously to moving - . - 
Turned quite round - - - 
Back again - 
Turned round - - 
Back again ----- 
16.7 
16,4 
19,0 
15.8 
*3.7 
— o >3 
+ 2,6 
— 3>2 
— 2,1 
// 
— 0,09 
+ 0,78 
— 0,96 
— 0,63 
The micrometer wire not being perfectly horizontal, the 
cross was brought precisely to the same part at each experi- 
ment. 
9th Set. 
Previously to moving - - 
Turned round - 
Back again - 
Turned round - 
Back again - - - - 
Turned round - - . - 
1 1,0 
10,2 
10,5 
8,4 
8,1 
0 0 0 N 0 
1 1 + 1 1 
t • 
7 / 
0,21 
— 0,03 
+ 0,09 
— 0,63 
0.09 
The side and subsequently the whole float, whilst replac- 
ing, pressed gently upon the mercury. 
