Steam in producing Electricity. 3 
arrows indicate the course of the steam which passes, in the 
first instance, through a lateral slit or saw-cut in the brass, 
-about 35th of an inch wide, then through a circular hole in the 
centre of the cap about ~/;th of an inch in diameter, and finally 
through the wooden channel from which it is ejected into the 
air. The passage through the wood is of cylindrical form, 
and of somewhat larger diameter than the circular hole in the 
centre of the brass. Vig. 3 is a stop-cock, with a socket to 
receive the plug, which is kept firmly down by a screw- nut 
at the top. 
Several cocks of this description, each fitted with a wooden 
plug, such as I have described, are screwed into an iron vessel 
communicating with the boiler, and in which the proper 
quantity of moisture, to be carried out with the steam, is de- 
posited by condensation. ‘The steam is used at a pressure of 
about 70 pounds on the square inch, and is discharged hori- 
zontally in diverging jets. ach jet affords quite as much 
electricity as a good electrical machine of ordinary dimensions; 
and when it is considered that a boiler,of evaporating power 
equal to that of a locomotive engine would be adequate to 
sustain hundreds of valour an idea may be. formed of the 
2 
