10 On the Mean Density of the Earth. 
Page 403, line 15, for 10683, read 10685. 
Page 404, line 11, for 185, read 186-5. 
Ib. in lines 15, 16, 22, 25, for 185, read 186°5. 
It is to be noted, that after the experitnents have been all 
made, and the motion of the arm carrying the small balls, and 
expressed in 20ths of an inch, observed and denoted by the let- 
ter B; also the time of one vibration expressed in seconds, de- 
noted by the letter N; and both of these being corrected ac- 
cording to certain rules there glven; then the mean density of 
the earth D, in each experiment, is to be computed by this 
theorem, viz. 
= a or when corrected, D = ome 
And by that theorem were calculated the following 29 experi- 
ments, as they stand recorded in the original. 
Table of the Results of the Experiments. 
| 
Motion of/The same| Time of | Ditto |The Den- 
the Arm. |corrected.|Vibration.|corrected.| sity. 
xperi- 
ments. 
E 
— 
| : * 
we ine.|20ths inc. 
1 | 1432 | 13-49 5-50 
2 }141 | 13-17 561 
3 | 15 14.69 4-88 
Adhd Able hil 5-07 
rane 13-56 526 
6 | 4 13-28 5°55 
7131 2-95 6 54 | 536 
8 | 6li ; 5-29 
9 | 549: 5:58 
59 im 5-65 
5 98 , 5°57 
303 | 29 553 
59 5-71 5-62 
315 | 3-03 5-29 
real 5-9 r| 6 57) B44 
313 | 3-00 5:34 
ye 5-79 
6:32 6 58 5-10 
615 6 59 5:97 
i ‘ia: 5:39 
7 3 5-42 
7 6 5 47 
ae 5-63 
76 5-34 
1.6 5:46 
Phas 5-30 
716 575 . 
7 3 5-68 
7 3 5-85 
