and the Economy of Fuel. 135 



after having circulated in the flues under the second 

 boiler, passes through a long flue (constructed like hot- 

 house flues), which goes round two sides of the drying- 

 room (which is adjoining to the washing-room), and then, 

 passing through the wall of the drying-room into the 

 ironing-room, it goes off into an open chimney. As 

 the bottom of the second boiler lies on a level with the 

 top of the first, the warm water runs out of the second 

 to refill the first, by a tube furnished with a brass cock, 

 which greatly facilitates the filling of the principal boiler. 

 The wooden covers of these boilers, which are double and 

 movable on hinges, are shut down in grooves in which 

 there is water; and the steam, being by these means 

 confined, is forced to pass off by a wooden tube, which, 

 standing on a part of the cover which is fastened down 

 to the boiler with hooks, carries the steam upwards to 

 the height of seven or eight feet, where it goes off 

 laterally by another (horizontal) wooden tube, through 

 the wall into the drying-room. As soon as this horizontal 

 wooden tube has passed through the wall into the dry- 

 ing-room, it ends in a copper tube, about 3 inches in 

 diameter, which, lying nearly in a horizontal position, 

 conducts the steam through the middle of the drying- 

 room in the direction of its length, and through a hole 

 in a window at the end of the room into the open air. 



The steam, in passing through the drying-room in a 

 metallic tube (which is a good conductor of heat), gives 

 off its heat through the sides of the tube to the air of 

 the room, and the water which is condensed runs off 

 through the tube. By sloping the tube upwards, instead 

 of downwards, as by accident it was sloped, the con- 

 densed water, which is always nearly boiling hot, when 

 it is condensed might be made to return into the boiler, 



