350 
MR. airy’s account OF THE HARTON EXPERIMENT 
Pendulum 8. Eighth Series. 
No. of 
Swing. 
Number of 
Coincidences. 
Number 
of 
Mean 
Interval. 
Arc of Vibration. 
Mean of 
Thermo- 
meter 
Readings. 
Mean of 
Barometer 
CoiTccted 
Log. Rate of 
Pendulum 8 upon 
Earnshaw. 
Beginning. 
End. 
Intervals. 
Beginning. 
End. 
Readings. 
113 
3 * 
3 
45 
s 
270-14 
2-20 
0-68 
94-28 
in. 
29-745 
9-99691921 
114 
3 
3 
47 
270-57 
2-02 
0-61 
92-44 
29-800 
2012 
115 
3 
3 
42 
270-21 
2-08 
0-72 
93-11 
29-880 
1775 
116 
3 
3 
37 
270-51 
1-92 
0-74 
94-44 
29-975 
2399 
117 
3 
3 
53 
271-08 
1-98 
0-50 
91-29 
30-075 
2397 
118 
3 
3 
• 36 
270-93 
2-10 
0-83 
93-39 
30-190 
2787 
119 
3 
3 
35 
269-97 
2-10 
0-82 
95-80 
30-265 
2146 
120 
3 
3 
49 
269-78 
2-11 
0-58 
98-00 
30-330 
2313 
121 
3 
3 
52 
270-78 
2-07 
0-55 
95-78 
30-380 
3047 
122 
3 
3 
42 
270-90 
1-95 
0-66 
94-39 
30-420 
2917 
Section XIII. — Computation of Log. Rate of Pendulum 1821 on Pendulum 8; com- 
bination of individual results ; and conclusion on the amount of temperature correc- 
tion, and on the result of the Harton Experiment. 
„ T Rate of Pendulum 1821 . „ , ... . . 
72. The quantity Log. - R ^ e ' orPenduIun T s ~ foi’wied, as a similar quantity is 
formed in Section VI., by combining together 
_ Rate of Pendulum 1821 
Rate of Shelton 
Lo 
Rate of Shelton 
O' 
Rate of Earn SHAW 
Log. 
Rate of Pendulum 8 
Rate of Earnshaw* 
Results for the Log. Rate of Pendulum 1821 upon Pendulum 8. 
Fifth Series. 
Sixth Series. 
Seventh Series. 
Eighth Series. 
No. of 1 
Swing. 
f ^ Rate Pendulum 1821 
No. of 
Swing. 
, Rate Pendulum 1821 
No. of 
Swing. 
T Rate Pendulum 1821 
No. of 
Swing. 
f Rate Pendulum 1821 
^ ® Rate Pendulum 8 
Rate Pendulum 8 
° Rate Pendulum 8 
Rate Pendulum 8 
83 
0-00072074 
93 
0-00072767 
103 
0-00071958 
113 
0-00072044 
84 
71959 
94 
72205 
104 
72227 
114 
71944 
85 
72363 
95 
73117 
105 
72151 
115 
72562 
86 
71927 
96 
73178 
106 
72380 
116 
71854 
87 
72467 
97 
73015 
107 
72725 
117 
71865 
88 
72667 
98 
72592 
108 
72805 
118 
71526 
89 
72242 
99 
72774 
109 
72363 
119 
72350 
90 
72155 
100 
72538 
no 
72320 
120 
72205 
91 
72123 
101 
73270 
111 
72298 
121 
71687 
92 
72006 
102 
72812 
112 
72240 
122 
7I8O9 
73. We have now to consider how the individual results of each Series are to be 
combined. And here it is to be remarked, that the principal cause of error is not, in 
these experiments, the uncertainty of comparisons of clocks (which was almost the 
only source of error in the experiments at the mine). It is probable that the amount 
of uncertainty from this cause is here nearly unappreciable. The principal sources 
of error will lie in the circumstances of the pendulum-observations; chiefly, perhaps. 
