168 Captain Kater's description of 
now show the effect that would result from using the mean 
of a few of the preceding observations. 
Wooden Float. 
Error in 
Seconds. 
% 
Mean of the first four - - 
n 
— 0,34 
1st Set. < 
Mean of the second four - 
— 0,67 
AC S 
Mean of the first five - - 
+ 0,^6 
2d Set. -j 
Mean of the second five - 
— 0,66 
Iron Float. 
c 
Mean of the first five - 
— 0,16 
Mean of the second five - 
— 0,40 
3d Set. < 
Mean of the third five - — 
— 0,02 
1 
Mean of the last six - 
0,00 
4th Set. 
Mean of five - - 
+ 0,02 
5 th Set. 
Mean of five - - 
— 0,31 
6th Set. 
Mean of five - - 
— 0,24 
7th Set. 
Mean of five - - 
— 0,09 
8th Set. 
Mean of four - - 
— • 0,22 
9th Set. 
Mean of five - - 
— 0,17 
10th Set. 
Mean of five 
+ 0,12 
nth Set. 
Mean of five - _ _ 
— 0,17 
Iron Float browned. 
12th Set. 
Mean of five - 
-f- 0,02 
13th Set. 
Mean of five - - 
— 0^35 
Long Iron Float. 
14th Set. 
Mean of five - - 
+ 0,13 
15 th Set. 
Mean of five - - - 
— 0,17 
Short heavy Float. 
16th Set. 
Mean of five - - 
+ 0,02 
17th Set. 
Mean of five - - - 
— 0,10 
1 8th Set. 
Mean of five - - 
— 0,02 
19th Set, 
Mean of five - - 
— 0,02 
20th Set. 
Mean of five - - 
+ 0,15 
2 1 St Set. 
Mean of five - _ _ 
— 0,21 
22d Set. 
Mean of five - - 
— 0,18 
Long Float browned. 
23d Set. 
Mean of five 
4- 0,26 
24th Set. 
Mean of three 
— 0,09 
25th Set. 
Mean of five 
+ 0,04 
26th Set. 
Mean of five - - 
— 0,16 
