264 
DR, J. YOUNG AND PROFESSOR G. FORBES ON THE 
January 20, 1881, No. 5, 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
2,926 
5,687 
11,243 
2,761 
2,778 
4,307 
8,465 
8,863 
22,476 
32,127 
45,550 
55,022 
68,216 
23,264 
(23,074) 
22,895 
22,666 
369 
408 
Signal at 6,119 
Signal at 36,377 
^' = •002768 
s=34,060 
4/= 378 
v= 1-1537 
Correction for friction, &c. = — ‘0046 
v= 1-1491 
n--,= 415-15 
V 
January 20, 1881, No. 6. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
231 
2,642 
7,449 
2,411 
2,404 
1,437 
5,046 
515 
9,890 
23,072 
32,309 
45,300 
54,433 
22,557 
(22,419) 
22,228 
22,124 
329 
295 
Signal at 3,810 
Signal at 24,108 
E =-002406 
s=21,141 
4/= 331 
v= 1-1210 
Correction for friction, &c. = — -0022 
v= 1-1188 
n' = V i= 465-00 
V 
From Nos. 5 and 6 
• Correction for second term 
j 
-85. 
