for heafivg hij hot JVafc 7\ 



299 



feeding-pipe with a stop-cock ; o is a stop-cock for drawing off 

 the water from the boiler when it is not in use; p is a hd which 

 fits on to the fuel pipe (c.) The dimensions are as follows : — 

 The height of the furnace from g to r is 18 in. The height of 

 the pipes c and d, from r to s, is 9 in. The diameter of the 

 pipes c and c? is 4 in. The diameter of the furnace, at the bot- 

 tom, is l^in. ; and at the top 12 in. The upper flange is 5 in. 

 wider; and the lower flange is 2 in. wider. The staves are 

 2 ft. 6 in. high. 



There is very little heat lost in the pipes b and c, for the 

 water absorbs it so fast, that a person may hold his hand on 

 them without feeling the least inconvenience. The boiler can 

 be used hermetically sealed, by closing the pipe Ji ; but this 

 should not be done unless the outside is extra-hooped. 



When the fire is put out, the ashes are removed by pulling 

 out the pin /-, when the grate falls down and empties itself into 

 the ashpit. The grate is easily replaced by opening the door, 

 raising it up, and replacing the pin. The poker used for this 



