12 On the Mean Density of the Earth. 
The corrected Table of the Experiment Results. 
Motion of| Time of | Do. in |Densities 
arm cor. |vibr. cor. | Seconds. | correct. 
20ths inc.| min. sec.| seconds. {densities. 
if 13-46 14 55 895 5:49 
2 13-21 14 55 895 5:59 
3 15°17 14 55 895 4-86 
4 14-68 14 42 882 4:89 
5 14-46 14 39 879 4:93 
6 13-63 14 54 894 5-41 
7 9:92 6 54 414 5:41 
8 
9 
3°09 joel 421 5:29 
2:96 7 3 423 5°57 
10 2:95 Lad: 425 5:64 
11 2:99 Vike 425 5°57 
12 2:85 6 57 417 5°62 
13 2:86 6 57 417 5:6] 
14 DOT 6 57 417 5:40 
15 2:95 6 57 417 5:43 
16 2:97 6 57 417 5-40 
17 2:77 6 57 417 5:79 
18 3°16 6 58 418 5°10 
19 3-08 6 59 419 5:26 
20 3°03 rd 421 5:38 
21 3:05 7 3 423 5°42 
22 3:06 7 6 426 5:47 
23 2:99 ad, 427 5°64 
24 3:14 10 426 5°34 
25 3:07 “igh, 426 5:46 
26 3°17 Li 427 5:30 
27 3:05 7 16 422 5°38 
28 2°89 7 2 422 5:68 
29 2:82 tans 423 5°85 
Here the medium of the first six of these experiments is 5-19; 
of the other 23 experiments it is 5°43; and the mean of both 
these means is 5:31, instead of 5°45, as stated in the former table, 
being the error arising from the sum of the numerical calcula- 
tions. The remaining difference 0:31, about the 17th part of 
the whole, must therefore be ascribed to the inaccuracy of making 
and reading off experiments, with such intricate and inadequate 
machinery. 
I cannot conclude this paper of inquiry, without expressing a 
hearty wish for a repetition of the large or mountain experiment, 
in some other favourable situation, and with improved means, if 
possible. For this purpose, I shall venture just to mention an 
idea which has sometimes occurred to my mind, namely, that one 
of 
a 
