By Mr. William Whale. 



205 



The house is forty feet long, and ten feet wide inside, 

 heated by a boiler placed in a recess in the centre of the back 

 wall ; the fire-place under the boiler is got at from a back 

 shed. 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 and a half inches diameter. Two of them are joined 

 to the boiler just above the bottom, and the other two directly 

 above, and just below the surface of the water. The house 

 is divided by glazed partitions into three compartments, 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 horizon- 

 tally to the front of the house ; when one upper and one lower 

 pipe branch to the east compartment, and other two pipes 

 to the west, and are carried to the ends of the house along 

 the sides of the flues, where they unite to cast-iron reservoirs 

 at each end of the house, which reservoirs are each three 

 feet six inches long, one foot six inches wide, and one foot 

 eight inches deep, having iron covers. These reservoirs are 

 filled with water that communicates by means of the pipes 

 with the water in the boiler. 



When the boiler, pipes, and reservoirs 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 reservoirs, the cooled water finding its way back to the 

 bottom of the boiler through the under pipes ; and the circu- 

 lation continues regular as long as there is any heat under 

 the boiler, the hot-water flowing through the upper pipes to 



