Experimental Inquiries respecting Heat and Vapor. 313 
Eup 3 aq { Rapidity increased by deficiency of tempera- 
ture to maintain the repulsion uninterrupted. 
6 150 ; ne kept some time on the fire without liquid 
efore this experiment. 
a5...44¢0 
8 134 
G. 128 
10 120—Very faintly luminous in the dark, 
8 SR 8 
fom L134 
14 100 Redness gradually increased. 
1595 
16 82 
The surface of the basin about the spirits exhibited when the room 
was darkened, a very distinct luminousness, like a faint lambent 
flame, owing, probably, to the vapor being heated nearly to redness 
atthe moment of production. A similar appearance had been ob- 
setved in the vapor of water, produced from metal at a white heat. 
Having now removed the basin from the fire, the experiments 
were continued, and the time was observed to increase from eighty 
two seconds to one hundred and five, and then to one hundred and 
- thirty five, after which it began to diminish, as the establishment of 
cohesion between the liquid and the metal became more decided, thus 
qe 
MCE 2 my 8 105” Exp: 201 2- fengeek 
fee - = 135 21 - -.10 
19. +. gee. 90 , 
The above series xperiments is in accordance with several of 
those made upon water, where the initial temperature of the iron was 
Very great and the mass sufficient to supply heat of a high tension, 
lo the evaporating surface, for a considerable length of ume after 
being removed from the fire. This was the case in the Jirst, second, 
ffth and eighth series in the second course on the rate of decrease.* 
In those cases, the times exhibited either a succession of numbers 
nearly equal, or an actual increase during the first five or six experi- 
nents of each series. ‘This is particularly remarkable in the eighth 
Series, of which a projection has been given. The order of magni- 
tudes, for the first six experiments, beginning with the highest, was 
lollowed in that projection, merely for the purpose of exhibiting the 
on SR a ne realy NTE Se eas a 
* See page 76 of this volume. 
Vou. XXI.—No. 2. 40 
