OF THE VIBRATIONS OF AN INVARIABLE PENDULUM. 
225 
Observers. 
Thermometers. 
1 
Gauge. 
Times of 
Disapp. 
Re- 
ipp. 
Coincidence. 
m 
S 
m 
S 
14 
19 
14 
31 
1 h 
m 
8 
22 
45 
23 
01 
> 3 
22 
53.33 
31 
16 
31 
28 
J 
53 
02 
53 
34 
4 
01 
33 
02 
05 
>12 
01 
49.17 
10 
05 
10 
36 
J 
7 
42 
8 
25 
1 
16 
21 
16 
47 
>21 
16 
34.17 
24 
51 
25 
19 
/ 
Arc registered 
and true Arc. 
Mean 
Interval. 
Correc- 
tion for 
Arc. 
Reduc- 
tion to 
36°. 
Corrected 
Vibrations 
at 36°. 
Captain J 
Sabine. | 
Mr. f 
Taylor. | 
Mr. f 
Taylor.^ 
1 
2 
3 
62 
63 
64 
127 
128 
129 
35.9 
35.*9 
35.5 
36.6 36.7 
’""I”!" 
36.4 36.5 
37.4 
37.3 
36.4 36.5 36.6 
j 35.77 i + 0.75 = 36.52 
inch. 
0.63 
0.63 
6*70 
Div. o 
0.91 = 1.09 
0.415 = 0.50 
0.17 = 0.20 
510.42 
512.08 
+ 1.00 
+ 0.18 
+ 0.27 
+ 0.19 
86316.11 
Gauge 0.63 
86316.31 
Gauge 0.665 
0.653 
86316.21 
The air was then re-admitted, and the following observations made. 
Observers. 
Thermometers. 
Stand- 
Times of 
Arc registered 
Mean 
Correc- 
Reduc- 
Corrected 
;§"■§ 
i 
2 
3 
4 
ard 
Barom. 
Disapp. 
Re-app. 
Coincidence. 
and true Arc. 
Interval. 
tion for 
Arc. 
tion to 
36'. ! 
Vibrations 
at 36 D . 
Mr. \ 
Taylor.'' 
r 
i 
o 
O 
O 
o 
inch. 
m s 
53 33 
m s 
53 43 
h m s 
Div. 0 
0.80 =0.96 
2 
3 
36.7 
36.6 
36.7 
36.7 
30.03 
01 45 
09 59 
01 55 
10 10 
.22 01 50.83 
l . 
26 
19 58 
20 26 
>496.0 
+ 0.49 
+ 0.25 
86305.69 
Captain j 
27 
28 
28 16 
28 43 
36.5 
36.5 
36.6 
36.5 
30.07 
:> 1 36 46.5 
0.185 = 0.22 
J 
Sabine. ' 
29 
44 50 
45 19 
30 
53 03 
53 37 
36.6 
30.05 
; Capill. + 0.019 ; Redaction to 32° — 0.018; =30.051. 
86305.69 
The vibrations in this experiment were as follows : 
January 30. Previous to the vibration in 
the rarefied medium 
January 31. Subsequent to the vibration 
in the rarefied medium 
86305.9/ ; 
86305.69 ; 
Barom. 29.4/4 inches. 
Barom. 30.051 
Mean . . . 86305.83 ; Barom. 29.762 
The vibrations in a rarefied medium reduced 1 „„„ . „ . 
to the same temperature as those in air j 
Gauge 0.653 inches. 
Whence there appears as the result of this experiment, a difference of 10.38 
vibrations per diem, corresponding to a difference of atmospheric pressure of 
29.109 inches of mercury at 32°; the temperature of the air of full pressure 
being 36°.4 ; and that of the rarefied air, 36°.52. 
2 G 
MDCCCXXIX. 
