a floating collimator. 
I'Ss 
y 
Iron Float browned. 
12th Set. 
Division 
of 
Microm. 
Difference. 
Error in Sec", 
affecting the 
Horiz. point. 
Dec. 2 8 
Out and replaced, S first 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditso - - dttto 
20,0 
20,5 
19,9 
19,0 
15^9 
20,3 
’ + 0,5 
— 0,6 
— 0,9 
— 
+ 4>4 
// 
+ 0,15 
— 0,1 8 
— 0,27 
— o>93 
4" *>32 
13th Set. 
Out and replaced, O first 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - ditto 
22,2 
15.8 
17.8 
23>5 
22,6 
16,4 
— 6,4 
+ 2,0 
+ 5>7 
— 0,9 
— 6,2 
// 
1,92 
-f 0,60 
+ 1.7* 
— 0,27 
— 1,86 
I now made the following experiments with the long float, 
the rough surface of which had been made smooth by rubbing 
it with wax. 
Long Float. 
r 
14th Set. 
Dec.29 
Out and replaced, S first 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
Ditto - - ditto 
3*.o 
32,0 
34>8 
3 *.6 
37.3 
33+ 
+ 1,0 
+ 2,8 
— 3.2 
+ S>7 
— 4,2 
+ 0,30 
+ 0,84 
— 0,96 
+ i>7* 
— 1,26 
