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566 



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manage them ; but gardeners, or their j to the ends of the house along the sidea 

 assistants, cannot be so competent. j of the flues, where they unite to cast- 



" The heating with hot water has | iron reservoirs at each end of the iiouse, 

 none of the objections I have men- i g g", which reservoirs are each three 

 tioned as belonging to flues and steam. 1 feet six inches long, one foot six inches 

 The apparatus is simple, and not liable I wide, and one foot eight inches deep, 

 to get out of order. The boiler has 1 having iron covers. These reservoirs 

 only a loose wooden cover, and no | arefilled with water thatcommunicates, 

 safety-valves are required. The fuel I by means of the pipes, with the water 



consumed is very moderate, and when 

 once the water is heated, very little at- 

 tention is wanted ; for it retains its 

 heat for many hours after the fire has 

 gone out. 



" The house is forty feet long and 

 ten feet wide inside, heated by a boiler, 

 a, placed in a recess in the centre of 

 the back wall ; the fireplace under the 

 wall is got at from a back shed, b. The 

 boiler is two feet six inches long, one 

 foot six inches wide, and one foot eight 

 inches deep. From the end of the 

 boiler proceed horizontally four cast- 

 iron pipes of three inches and a half 

 diameter ; two of them are joined to the 

 boiler just above the bottmm, and the 

 other two directly above these, and 

 just below the surface of the water. 

 The house is divided by glazed parti- 

 tions into three compartments, d, e,f, 

 for the convenience of forcing one part 

 without the other. 



" The middle compartment is two 

 lights in width, and the other two have 

 four lights each. 



" The pipes from the boiler go hori- 

 zontally to the front of the house, where 

 one upper and one lower pipe branch 



n the boiler. 



" When the boiler, pipes, and reser- 

 voirs are filled, and a fire lighted under 

 the boiler, the heated water, ascending 

 to the top of the boiler, forces its way 

 along the upper pipes to the reservoir, 

 the cold water finding its way back to 

 the bottom of the boiler through the 

 under pipes ; and the circulation con- 

 tinues regular as long as there is any 

 heat under the boiler, the hot water 

 flowing through the upper pipes to the 

 reservoir, and, as it cools, returning 

 back to the boiler through the under 

 pipes. 



" I have repeatedly, after the water 

 has been heated, immersed a thermome- 

 ter in the reservoirs at the ends of the 

 house, and have only found a difference 

 of three or four degrees between that 

 and the water in the boiler. It is not 

 necessary to make the water boil ; and, 

 if the fire is judiciously managed, no 

 steam will be raised and no water 

 wasted. It is, however, necessary to 

 examine the boiler occasionally, and to 

 add water when any has evaporated. 



" Valves might be fixed in the boiler, 

 pipes, and reservoirs, for letting steam 



to the east compartment, and other mto the house if required ; but that 

 two pipes to the west, and are carried i would induce the necessity of boiling 



Fig. 163. 



