VELOCITY OE WHITE AND OE COLOURED LIGHT. 
267 
January 20, 1881, No. 8. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
2,823 
5,714 
11,528 
2,891 
2,907 
4,269 
8,621 
139 
16,186 
27,469 
43,326 
54,535 
70,190 
27,330 
(27,140) 
27,066 
26,864 
264 
276 
Signal at 8,014 
Signal at 28,248 
A =’002905 
s=29,789 
4/= 266 
v= 1-3570 
Correction for friction, &c. = + "0007 
v= 1-3577 
n '=-, = 467’37 
V 
( 
From Nos. 7 and 8 - 
2m ^ — ^ D - = 187,037 
r+1 
b' 
* , — 1’00122 
9 + P 
Product=V=187,266 
' 
y Correction for second term = +229 
J 
January 21, 
1881, No. 2. 
Wheel. 
Clock. 
Reading. 
Differences. 
At mean reading. 
Reading. 
Alternate 
differences. 
Alternate second 
differences. 
4,207 
4,058 
2,598 
5,506 
17,526 
24,761 
6,805 
28,819 
415 
• • 
• • 
(24,346) 
2,590 
10,690 
53,165 
394 
• • 
65,962 
23,952 
14,574 
77,117 
Signal at 9,000 
Signal at 39,234 
a= 41.043 
«'= *002593 
¥= 
410 
v= 
1-2173 
Correction for friction. &c. = + "0015 
n =-,=470*04 
V — 
1-2188 
2 m 2 
