to the Air by a Steam Jet 131 
: TaBLeE II. 
Distance of electrode| Charge indicated 
from orifice by electrode 
15 cm. + 
OS + 
5 ” ete 
2» + 
IS) 5 0) 
195) 5, - 
DO) 5 + 
ick - 
195) 5, — 
IG Siee. O 
98) + 
30 ,, + 
DO) + 
IMA op = 
The position of the point of inversion varied with the pressure, 
and the greater the pressure the farther the point was from the 
orifice, but there did not seem to be any very definite relation 
between the pressure and the position of the point, owing probably 
to irregular condensation. 
| Fig. 2. The steam escaping from the boiler forms a cone somewhat as shown. At 
points in the cloud above C a positive charge would be indicated ; at d no 
charge, at B a negative charge. 
If a jet of steam escaping under pressure is closely examined 
_ it may be seen that visible condensation does not occur until the 
steam has gone some distance from the orifice, that is the steam 
remains ‘dry’ and the jet of steam takes the form of a short 
cylinder, which opens out into a cone at some distance, which 
_ depends upon the diameter of the orifice and upon the pressure of 
the steam (fig. 2). The change of sign seems to occur at the point 
where the cylinder opens out into a cone, that is where the steam 
passes from the dry to the wet condition. The outer layer of the 
