MR. W. C. D. WHETH4M ON TONIC VELOCITIES. 
351 
Mean upward velocity . . . . = SMS centims. per hour. 
,, galvanometer reading . . = 35°'3, 
In the same way the observations of downward velocity came out 3‘28 and 3’55 
for galvanometer readings of 35’2 and 35'1, and when new solutions were set up 3’45 
for 36-4. 
Mean downward velocity . . . = SMS centims. per hour. 
,, galvanometer reading . . = 35°'G. 
The means in each direction are 
which gives 
V — 3M5 G = 35°M, 
_ 3M5 X M30 x 129 x -00910 
yr 60 X 60 
= 0*00048 centim. per second. 
The galvanometer was too sensitive, and had to be shunted and regraduated with a 
Daniell cell. 
Resistance. 
Resistance. 
O 
70 -- 49-0 
140= .32-7 
75 = 47-7 
150 = 31-9 
80 = 46T 
160 = 30-0 
85 = 44'9 
180 = 26-9 
■ 90 = 43-7 
200 = 23-8 
95 = 42-3 
230 = 20-2 
100 = 41T 
260 = 17-3 
110 = 38-9 
300 = 14T 
120 = 36-9 
320 = 12-7 
130 = 35T 
350 = 11-4 
Resistance of battery + galvanometer + wires = 1 ohm. 
An E.M.F. of about one-third that used above was then applied with the following 
results:— 
Current upwards. Movement downwards. 
Galvanometei’. 
Time. 
Position. 
Galvanometer. 
Time. 
Position. 
Result. 
Centims. per lionr. 
12'5 
12.30 
23-65 
O 
12-5 
12.45 
24-04 
•39 
1 
.31 
•67 
.46 
•04 
•37 
^ 1-48 
.32 
•70 
.47 
•05 
•35 
/ 
12-7 
1.4 
24-92 
1-2-7 
1.19 
25'27 
•35 
.5 
•95 
.20 
■30 
-.35 
i 1-39 
.6 
•98 
.21 
•32 
•34 
i 
