650 REGNAULT’S HYGROMETRICAL RESEARCHES. 
Liquid run Liquid run 
t. t’. tt. Pin. t, DB tt. |“Ohin Vv. 
— | ———$ |__| _ | | 
1466 | 7:28 738 797 || 21-48 | 10:78 | 10-70 815 
1473 | 6-64 8-09 | 1096 || 21:50 | 10°05 | 11-45 | 1117 
14:93 | 5°39 9:54 | 1466 || 21-63 9-49 | 1214 | 1523 
1496 | 516 9-80 | 1845 |! 21-70 9-18 | 12:52 | 1947 
1496 | 467 | 10-29 | 3045 || 21-70 8:67 | 13:03 | 3019 
14:96 | 4:33 | 1063 | 5067 || 21-70 856 | 1314 | 3330 
To compare these numbers more easily, we will refer them to 
the same temperature ¢ in each of the two series. This tempe- 
rature will be 14°:96 for the first series, and 21°70 for the second. 
For this purpose we shall add to the values of ¢' quantities equal 
to those which we should have had to add to the values of ¢ to 
establish equality. As the quantities to be added are very small, 
this correction cannot occasion any sensible errors. We shall 
thus obtain :— 
t. Uv. t-t/, {Liquid in 1’. t. tv, ¢t—t/. |Liquid in 1’. 
14:96 7°58 7°38 797 =|; «21-70 11-00 10-70 815 
14:96 6°87 8-09 1096 21°70 10°25 11-45 1117 
14:96 5°42 9°54 1466 21:70 9°56 12°14 1523 
14-96 5°16 9°80 1845 21-70 9°18 12°52 1947 
14:96 4:67 10-29 3045 21:70 8:67 13-03 3019 
14-96 4:33 10°€3 5067 21-70 8°56 13°14 3330 
ns Ss Sn nn EES dS SnaEsSn SSSR 
It is seen that, for the same temperature ¢, the temperatures 
i! depend much on the velocity of the current of air. If we cal- 
culate with the formula (3.) the temperatures ¢’ which correspond 
to the temperatures ¢, we find,— 
fort=14°96 ?#=3%73 t¢t—?t) = 11°23 
#=21°70 t=7°36 t—?¢ = 14°34 
The values of ¢' which we thus find are still less than those 
which we have found in our experiments with the more rapid 
escape of water. 
A pretty exact idea may be formed of the course of these ex- 
periments by representing them by a graphic curve. We take, 
on the line of the abscisse, lengths proportional to the velocities 
of flowing, and on the corresponding ordinates, lengths propor- 
tional to the temperatures 7’ of the moist thermometer. For 
v=O0 we shall evidently have ?/=¢; this is the point at which 
the curve bisects the axes of the ¢. If we draw a parallel to the 
axis of the v, at a distance equal to the value of ¢', deduced from 
our formula, we should have an asymptote to the curve, if this 
