5 
new standards of weights and measures. 
che clock, this constant difference of the number of vibrations 
from the truth will not affect the ultimate deductions. As 
the most direct method of removing any doubts which may 
be entertained upon this subject, I shall add a comparative 
Table of the successive differences of the number of vibra- 
tions in twenty-four hours, which I have computed from the 
whole of Captain Sabine’s observations, by employing the 
disappearances only, of the disk. 
Stations. 
St. Thomas 
Maranham 
Ascension . 
Sierra Leone 
Trinidad . 
Bahia 
Jamaica 
New York 
London 
Drontheim 
Hammerfest 
Greenland . 
Spitzbergen 
Differences by the 
method of 
disappearances. 
Differences by 
the method of dis- 
appearances 
and re- appearances. 
Difference of the 
results. 
Vibrations. 
Vibrations. 
Vibrations. 
9,62 
9,62 
0,00 
13,29 
* 3>33 
— 0,04 
4>97 
4>97 
0,00 
0,85 
0,83 
-f 0,02 
5 > 5 i 
5 ’ 5 ° 
+ 
12,40 
12,46 
— 0,06 
72,72 
72,71 
+ 0,01 
\i >88 
41,81 
+ 0,07 
38,62 
38,73 
— 0,1 1 
22,48 
22,44 
+ 0,04 
9>53 
9,48 
+ 0,05 
12,62 
12,49 
+ 0,01 
Mean . . 
0,00 
As the comparative results, by the method of disappear- 
ances, would to a certain degree be vitiated by the use of a 
disk of a different size, the observations made in London in 
1824 with a silver disk are omitted. 
The differences of the results being so minute, and the 
mean of the whole being absolutely nothing, the conclusion 
is warranted that the method of observing coincidences by 
