268 
DK, J. YOUNG AND PROFESSOR G. FORBES ON THE 
January 21, 1881, No. 3. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
7,503 
9,949 
14,' 773 
2,446 
2,412 
8,726 
12,361 
5,879 
16,947 
29,678 
40,619 
53,017 
63,829 
23,799 
(23,672) 
23,339 
23,210 
460 
462 
Signal at 12,071 
Signal at 32,305 
+ = •002415 
s=28,841 
4/= 460 
v= 1-1836 
Correction for friction, &c. = — "0061 
v= 1-1775 
+'=^=487-58 
V 
r 
From Nos. 2 and 3 •{ 
+ ^ Pb = 187,897 
r + 1 ’ 
= 1-00116 
g+p 
Product=V=188,110 
V Correction for second term = +213 
January 21, 1881, No. 4. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
7,376 
9,893 
14,859 
2,517 
2,483 
8,635 
12,376 
4,725 
15,768 
28,334 
39,217 
51,650 
62,421 
23,609 
(23,449) 
23,316 
23,204 
293 
245 
Signal at 11,605 
Signal at 31,786 
v = -002940 
*=27,529 
4/= 288 
v= 1-1725 
Correction for friction, &c. = — ’0026 
v= 1-1699 
+=-,=469-85 
V 
From Nos. 3 and 4 - 
2m 187,860 
r+1 
S' 
, =1-00117 
g+p 
Product=Y= 188,079 
Correction for second term = +219 
