262 
DR. J. YOUNG AND PROFESSOR G. FORBES ON THE 
December 21, 1880, No. 10. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
3,542 
5,795 
10,310 
2,253 
2,258 
4,669 
8,053 
9,604 
19,223 
30,755 
40,272 
51,644 
61,034 
21,151 
21,049 
(20,889) 
20,762 
262 
287 
Signal at 6,918 
Signal at 37,186 
of=-002256 
s=41,236 
4/= 285 
v= 1-0445 
Correction for friction, &c. = + '0028 
v— 1-0473 
ml — -,=464 - 24 
V 
r 
From Nos. 9 and 10 •{ 
L 
2 J»+Affi > =186)537 
1=—= -999570 
9 + P 
Product=Y=186,457 
' 
- Correction for second term = —80. 
J 
December 21, 1880, No. 11. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
1,897 
4,721 
10,373 
2,824 
2,826 
3,309 
7,547 
2,422 
13,039 
25,757 
36,229 
48,770 
59,164 
23,235 
(23,190) 
23,013 
22,935 
322 
255 
Signal at 5,690 
Signal at 25,918 
v= -002825 
s=24,675 
4/= 325 
v= 1-1595 
Correction for friction, &c. = — -0009 
v= 1-1586 
w=®=410-12 
V 
a*fc±S^ =18W w 
1 - 
•999632 
g+p 
Product=V = 185,788 
From Nos. 10 and 11 
Correction for second term = — 79 
