354 Description of a new Boiler, constructed 



This description shows that there is nothing new in 

 the construction or arrangement of the upper part of 

 this boiler. In its lower part there is a contrivance for 

 increasing its surface, which has been found very useful. 



The flat circular bottom of the body of the boiler, 

 which, as I said before, is 12 inches in diameter, being 

 pierced by seven holes, each 3 inches in diameter, seven 

 cylindrical tubes of thin sheet-copper, 3 inches in diam- 

 eter and 9 inches long, closed below by circular plates, 

 are fixed in these holes, and firmly riveted, and then 

 soldered to the flat bottom of the boiler. 



On opening the communication between the boiler 

 and its reservoir, the water first fills the seven tubes, 

 and then rises to the cylindrical body of the boiler ; but 

 it can never rise above 6 inches in the body of the 

 boiler, for when it has got to that height, the floater is 

 lifted to the height necessary for shutting the cock that 

 admits the water. 



When the height of the water in the boiler is dimin- 

 ished a few lines by the evaporation, the floater descends 

 a little, the cock is again opened, and the water flows in 

 again from the reservoir. 



As the seven tubes that descend from the flat bottom 

 of the body of this boiler into the fireplace are sur- 

 rounded on all sides by the flame, the liquid contained 

 in the boiler is heated, and made to boil in a short time, 

 and with the consumption of a relatively small quan- 

 tity of fuel ; and when the vertical sides of the body 

 of the boiler and its upper part are suitably enveloped, 

 in order to prevent the loss of heat by these surfaces, 

 this apparatus may be employed with much advantage 

 in all cases where it is required to boil water for procur- 

 ing steam. 



