and tlie Economy of Fuel. 129 



results of experiments equally surprising, which have 

 been made with the roaster in the kitchen of the 

 Foundling Hospital, been made known to the public. 



Not only the roaster, but the boilers also which have 

 been put up under my direction in the kitchen of the 

 Foundling Hospital, have been found to answer very 

 well ; and I am informed that several other great hos- 

 pitals are about to imitate them. As I left London 

 before the kitchen of the Foundling Hospital was en- 

 tirely finished, I do not know whether there are dampers 

 to the canals by which the smoke goes off from the 

 fire-places of the boilers, and from that of the roaster 

 to the chimney. If there are not, I could wish they 

 might still be added ; and I would strongly recom- 

 mend it to those who may be engaged in construct- 

 ing kitchen fire-places on my principles, never to omit 

 them. 



Oval grates of cast-iron in the form of a dish, such 

 as I have described in the foregoing chapters of this 

 Essay, were tried in the kitchen of the Foundling Hos- 

 pital ; but the heat was found to be so intense that they 

 were soon melted and destroyed ; and we were obliged 

 to have recourse to common flat grates, composed of 

 strong bars of cast-iron. Perhaps the heat generated 

 in the combustion of pit-coal is so intense, when com- 

 pletely confined (as it ought always to be in closed fire- 

 places), that it will not be possible, where coals are used as 

 fuel, to use the hollow dishing grates I have introduced 

 in the public kitchens at Munich, and which have been 

 described and recommended in this Essay. 



Since my return to Bavaria, I have made several 

 experiments with grates composed of common bricks, 

 placed edgewise, and I find that they answer for that 



