CAPTAIN RATER’S CONVERTIBLE PENDULUM 
333 
which was the present object of inquiry, did not require that the convertibility 
should be very rigorously established, the following experiments were made to 
determine the comparative rate, in air of ordinary density, and in highly rarefied 
air ; first with the great weight below ; and second, with the great weight 
uppermost. 
Observers. 
° '3 
Standard 
Barom. 
Times of 
Arc registered 
Mean 
Correc- 
Reduc- 
Corrected 
c.S 
Z ° 
Therm. 
or 
Gauge. 
Disapp. 
Re-app. 
Coincidence. 
and true Arc. 
Interval. 
tion for 
Arc. 
tion to 
490. 
Vibrations 
at 49°. 
Captain 
Sabine. 
• 
1 
m s 
34 20 
m s 
34 33 
*1 
2 
3 
50.0 
29.630 
41 31 
48 42 
41 45 
48 58 
> 2 41 38 J 7 
00 
0® 
II 
1 , 
- 
17 
18 
29 35 
30 12 
>432.97 
+ 0.36 
+ 0.24 
86067.18 
Captain , 
Sabine. ' 
36 46 
37 25 
44 38 
51 52 
19 
20 
49.1 
29.630 
43 58 
51 11 
> 4 44 18.6 
0.15 = 0.18 
J 
21 
58 23 
59 06 
49.55 
29.630 
; Capill. + 0.019; Reduction to 32° —0.053; = 29.596. 
86067.18 
Great weight below. April 21, 1829. Clock by Dent making 86466.00 Vibrations. 
April 22. Clock making 86466.00 Vibrations. 
47.7 
1.05 
47.7 
1.05 
Div. 0 
0.92= 1.10 
1 • 
>449.44 
+ 1.60 
-0.24 
86082.60 
0.73 = 0.88 
J 
Mr, 
Taylor, 
Mr, 
Taylor 
1 
2 
3 
13 
14 
15 
m s 
19 49 
27 18 
34 47 
49 39 
57 10 
04 39 
19 59 
27 28 
34 57 
49 53 
57 24 
04 53 
h m 8 
0 27 23 
1 57 16.33 
47-7; + Index correction for a rarefied medium 0.75; = 48.45. Gauge 1.05. 
86082.60 
49.0 
29.350 
48.2 
29.350 
48.6 
29.350 
m 
S 
m 
S 
27 
19 
27 
32 
1 h 
m 
6 
34 
33 
34 
46 
f 2 
34 
39.33 
41 
46 
42 
00 
J 
39 
34 
39 
58 
1 
46 
49 
47 
15 
> 3 
47 
02.17 
54 
07 
54 
30 
J 
Mr. J 
Taylor. | 
Captain J 
Sabine. | 
1 
2 
3 
11 
12 
13 
Div. 
0.79 = 0.95 
1 8 
8 
>434.28 
+ 0.65 
0.30 = 0.36 
J 
-0.17 
86068.26 
29.350; Capill. + 0.019; Reduction to 32° — 0.052; = 29.317. 
86068.26 
