Mode of Heating Rooms hy Stearri. 1 75 



chishing of the pipes by the pressure of the atmosphere. 

 Similar valves, K, K, are placed near the top of the perpen- 

 dicular pipes E, E ; and from the middle one E^ the small 

 pipe passes through the roof, and is furnished with a valve 

 at r, opening outwards, to suffer the air to escape while the 

 pipes are filling with steam, or the steam itself to escape 

 when the charge •-; too high. 



The water condensed in the perpendicular pipes E,E, E, 

 trickles down their sides into the three funnels L, L, L, the 

 necks of which may either pass through or round the pipe C, 

 into the copper tube M, M, which also receives the water 

 condensed in C,C, by means of the short tubes N, N. The 

 pipe C, C, is itself so much inclined as to cause the water 

 to run along it to the tubes N, N, and the pipe G in the 

 garret has an inclination of 18 inches in its length, to brino- 

 the water condensed in it back to the middle pipe E. The 

 tube M, M, Carries back the water through the gable to the 

 boiler, which stands five feet lower than this tube. It is 

 material to return the water to the boiler, as, bein^ nearly 

 at a boiling heat, a considerable expense of fuel is thereby 

 saved. 



The large pipes are ten inches in diameter, and are made 

 of the second kind of tinned iron plates. The dimensions 

 of the smaller tubes are seen by their comparative size in 

 the drawing, and perhaps they might be varied without in- 

 convenience. 



The apparatus erected as here described, has been found 

 sufficiently strong, and has required no material repairs since 

 the first alterations were made. The leading object in the 

 instance under consideration being to save fuel, in order to 

 derive as much heat as possible from a given quantity of 

 fuel, the flue from the furnace, which heats the boiler, is 

 conveyed into connnon stone pipes placed in the gable. 

 These are erected so as to prevent any danger of fire, in the 

 manner shown in the drawmg, fig. 2. The steam wiili this 

 auxiliary communicates a heat of about 70° to the mill, the 

 rooms of which are 50 feet long, 32^ feet wide, and 8:^ feet 

 high, except the lower story and garret ; the former of which 

 tit 1 1 , and the latter 7 feet high. The rooms warmed in this 



Vol. 27. No. 106. March 1807. M manner 



