164 
Captain Kater's description of 
i 
Experiments to shoxv the effect of turning the box round. 
15 th Set. 
Divisions 
of 
Microm. 
Difference. 
Error in Sec®, 
affecting the 
Horiz. point. 
Dec. 29 
Previously to moving 
Turned round, (much agitation) 
Back again - 
Turned round - 
Back again - 
Turned round _ - - 
33>3 
32.5 
31.6 
31,0 
31,2 
3°>4 
— 0,8 
— 0,9 
— 0,6 
+ 0,2 
— ■ 0,8 
// 
— 0,24 
— 0,27 
— 0,18 
4- 0,06 
— 0,24 
I now laid aside the long float to try the short heavy 
float. 
Short heavy Float. 
1 6th Set. 
Out and replaced, S first 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
57>2 
59>7 
60,6 
56,1 
58,0 
57>6 
+ 2>5 
+ 0,9 
— 4>5 
+ *>9 
— 0,4 
+ 0,75 
+ 0,27 
— n 3 S 
+ 0,57 
0,12 
17th Set. 
Out and agitated the mercury, S first 
Ditto - - ditto 
Ditto » - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
67.0 
65,5 
68.1 
64^7 
60,7 
66,0 
— ns 
+ 2,6 
— 3>4 
— 4,0 
+ 4>7 
// 
— 0,45 
+ 0,78 
1,02 
1,20 
+ n 4 i 
The utmost care taken. The mercury carefully strained. 
