VELOCITY OF WHITE AND OF COLOUBED LIGHT. 
259 
December 21, 1880, No. 1. 
Wheel. 
Clock. 
Beading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
10,051 
12,614 
17,759 
2,563 
2,573 
11,333 
15,187 
5,652 
15,553 
27,477 
37,267 
49,048 
58,664 
21,825 
21,714 
(21,571) 
21,397 
254 
317 
Signal at 13,657 
Signal at 33,915 
A=-002569 
J=38,302 
4/= 310 
v= 1-0786 
Correction for friction, &c. = + "0032 
v= 1-0818 
n= V - =421-08 
V 
December 21, 1880, No. 2. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
5,790 
8,106 
12,700 
2,316 
2,297 
6,948 
10,403 
5,370 
17,091 
26,755 
38,289 
47,846 
59,302 
21,385 
(21,198) 
21,091 
21,013 
294 
185 
Signal at 8,679 
Signal at 28,958 
A=-002306 
s=27,726 
4/= 280 
v= 1-0599 
Correction for friction, &c. = — *0008 
v= 1-0591 
w'=^7=459-28 
V 
From Nos. 1 and 2 - 
$.+ 225 , 
r ’ 
g 
1-—-=0-999323 
9+P 
_ Product =V= 187,007 
2U 
Correction for second term = —125. 
