SIR WILLIAM SIEMENS, f.K.S. 63 



application ; and the object of the present paper is to describe an 

 application of this principle to furnaces of every description. 



The invention of the regenerative furnace is due to the writer's 

 In-other, Mr. Frederick Siemens; and it has been matured and 

 variously applied by the writer within the last few months. The 

 result has in all cases been a large saving in fuel over the plans in 

 rnmmon use, amounting to from 70 to 80 per cent, of the total 

 quantity of fuel hitherto consumed. The apparatus employed is 

 moreover of a very simple and permanent description, and com- 

 bines economy of fuel with other advantages, amongst which are 

 the total prevention of smoke and a general improvement in the 

 quality of the work produced. 



Figs. 1 to 4, Plate C, represent the new furnace in the form 

 applicable to piling iron, or heating iron, steel, or other substances. 



Fig. 1 is a longitudinal section of the furnace, and Fig. 2 a 

 sectional plan ; Figs. 3 and 4 are transverse sections. 



The furnace consists of the heated chamber A, and of two fire- 

 places or solid hearths B and 0, communicating respectively with 

 the two regenerators D and E. Each regenerator consists of a 

 series of walls of firebrick, laid in open Flemish bond, in such a 

 manner that the pigeon-holes of each wall are opposite the solid 

 parts of the succeeding wall, the object being to form a number 

 of zigzag or tortuous passages through the regenerators, leading to 

 opposite sides of the valve F, shown dotted in Fig. 1, at the 

 bottom of the chimney G. The valve F consists of a rectangular 

 box of iron open at the two sides to the two regenerators D and E, 

 at the bottom to the atmosphere, and at the top to the chimney 

 G. A spindle passes through the centre of the two remaining 

 close sides of the box, and carries a rectangular flap or moveable 

 plate, fitting the box sideways and bearing against one of its 

 upper and one of its lower edges, according to the position of the 

 tumbling lever and weight H which are fixed upon .the spindle 

 outside. 



When the valve is in the position shown dotted in Fig. 1, the 

 atmospheric air entering from below proceeds in the direction 

 indicated by the arrows, passing through the regenerator D, over 

 the fireplace B, through the heated chamber A, over the fire- 

 place C, through the regenerator E, and by the valve F into the 

 chimney G. 



