14a 



ImproDed Boiler for Hot-houses. 

 18 



a. Side view of the boiler. S, The feeder. c. Front view of the boiler. d. The ash pit 



Loddiges, Messrs. Guntar, the late Mr. Grange at Kings- 

 land, and the late Mr. Andrews of Vauxhall, the steam system 

 must undoubtedly be preferable. 



The pine-stove, which I have for the last twenty years 

 heated jointly with the flue and steam {Jig. 19.), I have now, 

 19 ...^^^ ^^ your suggestion, fitted up for heating by 



hot water ; and as I still intend using only 

 one fire, I consider that I shall gain in 

 fuel. When I first thought of the steam 

 method, I supposed that, while I heated 

 my fire-flue, if I placed a boiler of water 

 over the fire with a pipe attached for con- 

 veying the steam round the house, I should be throwing in so 

 much additional heat to the house, while at the same time it 

 took nothing from the heat that was carried along the flue; 

 so that I should thus make a great saving in fuel, which I 

 found to be the case. But, on considering the different 

 action of steam and hot water, I have given the latter the 

 preference ; as, jointly with the fire flue, where only one 

 house is to be heated, I find that I have an additional saving 

 in fuel. Before the steam can operate, the water must boil ; 

 and, as soon as the thermometer attains the degree required, 

 the fire must be damped ; consequently the vapour ceases to 

 rise, that which is in the pipes becomes condensed, and they 

 soon get cold. When the mercury falls again, the water 

 must again be made to boil, and so on. Not so the hot- 

 water pipes. When once the water is heated in them, it 

 rarely gets cold again. A little fire under the boiler will 

 maintain a slow circulation in the pipes, which may be in- 

 creased or diminished by the greater or less quantity of fuel. 



