Velocity of white and of colouke d light. 
263 
I 
January 20, 1881, No. 3. 
Wheel. 
1 
Clock. 
Reading, 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
9,610 
12,666 
18,767 
3,056 
3,051 
11,138 
15,717 
6,415 
21,264 
31,805 
46,456 
56,885 
71,344 
25,390 
(25,192) 
25,080 
24,888 
310 
304 
Signal at 13,914 
Signal at 34,168 
1 
v' = -003053 
s= 33,899 
4/= 309 
v= 1-2596 
Correction for friction, &c. = — '0002 
v- 1-2594 
«=->=412-53 
V 
January 20, 1881, No. 4. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
2,214 
4,960 
10,469 
2,746 
2,755 
3,587 
7,715 
7,554 
22,621 
33,322 
48,207 
58,791 
73,563 
25,768 
(25 586) 
25,469 
25,356 
299 
230 
Signal at 5,291 
Signal at 35,490 
F=-002750 
s= 35,450 
4/= 289 
v= 1-2793 
Correction for friction, &c. O'O 
vt= 1-2793 
n' = -,= 465-18 
V 
From Nos. 3 and 4 - 
n 0 + A)D b 1n/ , 
2m-=185,559 
r ’ 
1 
•999603 
g+p 
Product =V=186,495 
Correction for second term = — 74. 
