Fire-places and Kitchen Utensils. 483 



passage for the flame round the ends of the middle 

 cylinders. 



One evident advantage that will be derived from 

 constructing steam-engine boilers on the principles here 

 recommended is their superior strength to resist the 

 efforts of the steam, which will render it possible to 

 use very thin sheet copper or sheet iron in construct- 

 ing them, when they are made of those materials. 

 Another advantage will be the great facility of remov- 

 ing and repairing any of the cylinders which may 

 happen to leak, or which may be found to be damaged 

 or worn out. When several sets of cylinders are put 

 up for the same engine (which I would always recom- 

 mend, even for engines of the smallest size), any of these 

 occasional repairs may be made without stopping the 

 engine. 



If these cylindrical steam boilers should be found 

 to be useful for steam-engines, they cannot fail to be 

 equally so for generating steam for heating dyers' cop- 

 pers by means of steam, for bleaching by means of 

 steam, and, in general, for every purpose where steam 

 is wanted in large quantities. 



They must, I think, be peculiarly well adapted for 

 dyers ; for, as water less hot than boiling water is fre- 

 quently wanted by them in the course of their business, 

 the upper cylinders will at all times afford a plentiful 

 supply of warm water, which may, without the smallest 

 inconvenience, be drawn off whenever it is wanted. 



To prevent in the most effectual manner the loss 

 of heat which is occasioned by the passage of steam 

 through the safety-valve, that steam which so escapes 

 out of the boiler may be carried off in a tube provided 

 for that purpose, and conducted into the upper cylin- 



