NEW BOILER. V 



and shut, by means of a floater which swims on the surface Boiler for gene- 



of the water contained in the body of the boiler. ' ati "g st ? am ) 



J having its 



The second of the holes in the plate that closes the neck bottom termi- 

 of the boiler, receives the lower end of another vertical nating in tubes, 

 tube, which serves to convey the steam from the boiler to 

 the place where it is to be used. 



The third hole is occupied by a safety valve. 



This description shews 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 in- 

 creasing its surface, which has been found very useful. 



The flat circular bottom of the body of the boiler, which 

 as I said before is twelve inches in diameter, being pierced 

 by seven holes, each three inches in diameter, seven cy- 

 lindrical tubes of thin sheet copper, three inches in diameter, 

 and nine inches long, closed below by circular plates, are 

 fixed in these holes, and firmly rivetted, 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 six 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 diminished 

 a feAV 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 fire place, are surrounded 

 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 quantity 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 em- 

 ployed with much advantage in all cases where it is required 

 to boil water for procuring steam. 



And as in the case where the boiler is constructed on a 

 great scale, the seven tubes th.at descend from the bottom 



