I BOM WOOD AM) COAL. II 



long, which is covered with a thin plate of mica, resting on a 

 flange, or ledge, and kept in its place by a wire passing round 

 the cone. Through this plate of mica, the fire, may be seen, 

 thereby avoiding the necessity of opening the upper door for 

 the purpose of mere examination. 



The pipe is two inches diameter, and made of extra thin 

 black tin, to impart the heat to the air of the room with the 

 least possible obstruction. The elbow joints are each nine 

 inches long. The whole length of the pipe is forty-two feet : 

 and this was found insufficient to impart to the air of the 

 room all the heat generated, there being a loss of 3°, until tin 

 tin box. A. was attached to the pipe near its extremity. This 

 box is fourteen inches long, ten inches broad, and Jths of 

 an inch deep, and its interior and exterior surfaces are made 

 black. In passing through this box, the warm air is exposed 

 to a much larger surface than that presented by the pipe, and 

 the few degrees of heat which it before contained, are by this 

 means imparted to the air of the room. 



The joints of the pipe are perfectly closed by clay lute, and 

 its whole exterior surface is covered with a thin coat of dead 

 black varnish, made to resist heat. 



The valves B. C, D, to regulate, the admission of air into tin 

 stove, are all of the same construction, being circular pieces of 

 flat thick sheet iron, very accurately adjusted, to close the in- 

 terior of the pipe. Fig. 3, represents a side view of the valve 

 B, standing entirely open. The wire to which it is firmly riveted, 

 crosses the centre of the valve, and passes through the pipe. 

 This end of the wire serves as one of the pivots for tin valve 

 to turn upon, and the other end. being bent into a hall circle. i~ 

 used both as the handle to turn the \ ah e. and as an index to regu- 

 late it. The point of this eaters the graduated holes in the dial ; 

 Fig. 4. which is a front view, and is riveted to the exterior of 

 the pipe, being the half of a circle of flat sheet iron. who* 

 whole diameter is equal to that of the pipe. The handle is 

 bent to correspond i \ac1ly with the flat surface of the valve, by 

 which the situation of the handle indicate-, the position ofth 



valve inside of the pipe, so that bo mistake can occur in it- 

 use. 



