168 
REV. F. FALLOWS’S OBSERVATIONS WITH AN INVARIABLE 
Observations computed. 
No. of 
Observ. 
Mean 
Temp. 
Interval. 
Uncorrected No. 
of Vibrations. 
Clock’s 
Rate. 
Correc. for 
Arc. 
Reduc. to 
62 ° Fahk. 
Reduced No. of 
Vib" s in 24 Mean 
Solar Hours at 
62° Fahr. 
1 
71°.05 
h m s 
1 44 36.5 
86084.431 
+ 0.54 
+ 3.148 
+ 3.810 
86091.929 
o 
72.50 
1 44 48.0 
86085.440 
+ 0.54 
1.547 
4.421 
86091-948 
3 
72.57 
1 44 25.5 
86083.460 
+ 0.54 
3.458 
4.454 
86091.912 
4 
73.60 
1 44 36.0 
86084.392 
+ 0.54 
1.978 
4.883 
86091.793 
5 
69-27 
1 45 0.5 
86086.529 
-0.410 
2.666 
3.061 
86091.846 
6 
69.93 
1 45 20.0 
86088.216 
-0.410 
0.781 
3.338 
86091-924 
7 
70.60 
1 44 58.5 
86086.373 
— 0.410 
2.425 
3.620 
86092.008 
8 
70.55 
1 45 15.5 
86087.823 
— 0.410 
0.716 
3.600 
86091.729 
9 
70.52 
1 50 15.5 
86086.529 
— 0.410 
+ 2.609 
+ 3.587 
86092.315 
Correction for buoyancy 
Mean. . . . 
86091.934 
+ 5.944 
Number of Vibrations in vacuo, in 24 Mean Solar Hours . . 
86097-878 
Rate of the Sidereal Clock. 
Jan. 20th. 
Jan. 21st. 
By 0 Tauri 
S 
+ 0.44 
By /3 Tauri 
S 
-0.44 
$ Orionis 
0.47 
S Orionis 
0.40 
? 
0.50 
y 
0 34 
s 
0.82 
0.48 
Procyon 
0.64 
Pollux 
0.88 
Mean Rate. . 
— 0.41 
Mean Rate. . 
+ 0.54 
Remark. — From the above result, it appears that the rate varied nearly a 
second in the space of 24 hours : there is reason to suppose that the change 
was owing to some sudden derangement which the clock might have suf- 
fered on the night of the 20th. From the tolerable accordance with each other 
of the pendulum observations of the 21st, it may be presumed that the rate 
was equable during that day. 
Abstract of Mr. Johnson’s observations. 
Mean of 240 coincidences = 86097-702 
Mean of 180 coincidences = 86097-878 
True mean of 420 coincidences . = 86097-829 
