224 
CAPTAIN SABINE ON THE REDUCTION TO A VACUUM 
Observer. 
No. of 
Coincid. 
Thermometers. 
Stand- 
ard 
Barom. 
Times of 
Arc registered 
and true Arc. 
Mean 
Interval. 
Correc- 
tion for 
Arc. 
Reduc- 
tion to 
36°. 
Corrected 
Vibrations 
at 36=. 
1 
2 
3 
4 
Disapp. 
Rc-app. 
Coincidence. 
Mr. J 
Taylor. ] 
. 
1 
2 
3 
23 
24 
25 
o 
O 
O 
O 
inch. 
m s 
6 27 
14 43 
22 59 
8 14 
16 31 
24 48 
m s 
6 37 
14 51 
23 07 
8 27 
16 44 
25 01 
| h m s 
>23 14 47.33 
2 16 37.5 
Div. 0 
0.76 = 0.91 
0.25 = 0.30 
1- 
>495.92 
+ 0.55 
-1.52 
86303.94 
32.8 
33.0 
33.0 
31.8 
29.69 
| 
32.0 
32.1 
32.2 32.3 
29.83 
I 
32.4 
29.77; Capill. + 0.019 ; Reduction to 32° — 0.002; =29.787- 
86303.94 
The vibrations in air in this experiment were as follows : 
January 17- Previous to the vibration in') 0/ , or . . 10 ™ • v 
the rarefied medium j 86304.13 ; Barom. 29.670 inches. 
January 18. Subsequent to the vibration 1 86303 94 Barom . 29 . 787 
in the rarefied medium ‘ 
The vibrations in a rarefied medium, re- 
duced to the same temp, as those in air 
1 
: e -j 
tr J 
86304.03 ; Barom. 29.728 
86313.20; Gauge 3.59 inches. 
Whence the result, that a difference of 9. 1 7 vibrations per diem corresponds to a 
difference of atmospheric pressure of 26.138 inches of mercury at 32°: the tempe- 
rature of the air of full pressure being 32°.37, and that of the rarefied air 32°.45. 
Exp. V. — January 30th and 31st. Clock gaining 4 m 14 s .38. In air. 
Observer. 
No. of 
Coincid. 
Thermometers. 
Stand- 
ard 
Baronr? 
Times of 
Arc registered 
and true Arc. 
Mean 
Interval. 
Correc- 
tion for 
Arc. 
Reduc- 
tion to 
36 3 . 
Corrected 
Vibrations 
at 36 V 
i 
2 
3 
4 
Disapp. 
Re-app. 
Coincidence. 
Captain 
Sabine. 
1 
2 
3 
25 
26 
27 
o 
O 
o 
o 
inch. 
m s 
55 20 
3 35 
11 49 
13 43 
21 59 
30 14 
m s 
55 32 
3 47 
12 01 
14 08 
22 28 
30 47 
1 h m s 
J>1 1 03 40.67 
2 22 13.17 
Div. o 
0.88 = 1.06 
0.25 = 0.30 
1 • 
>496.35 
+ 0.68 
+ 0.08 
86305.97 
36.0 


36.1 
29.44 
36.4 
36.4 
29.50 
36.2 
29.47; Capill. + 0.019 ; Reduction to 32° — 0.015; =29.474. 
86305.97 
The air was then withdrawn, and the following observations made. The air- 
pump had been repaired, but 0.6 inch was the limit to which exhaustion could 
be carried by its means. The leakage of the apparatus did not exceed seven 
hundredths of an inch in the 18 hours of the experiments. 
