296 On the Construction of Kitchen 



blowpipe, in the Fig. 1 7, page 287 ; and in that figure part 

 of the iron strap is seen which supports the front ends of 

 the two blowpipes, and confines them in their places. 

 This strap will not appear when the roaster is set, for 

 it will then be entirely covered and concealed by the 

 brick-work. 



Where blowpipes are made of sheet iron, they should 

 be so constructed and so fastened to the roaster that 

 they may at any time be removed and replaced with- 

 out taking the roaster out of the brick-work. This 

 is necessary, in order that they may be taken away to 

 be repaired or replaced with new ones, when by long 

 use they become burned out and unfit for service. If 

 they be made with flanges, and keyed on the inside, and 

 if they be supported in front on an iron strap of the 

 form represented in Fig. 14, page 257, they may at any 

 time be removed with little trouble, by unkeying them 

 and removing a few bricks. When the bricks in front, 

 which it will be necessary to take away, are removed, 

 this will open a passage into the fire-place sufficiently 

 large to come at the wall at the farther end of the 

 fire-place, which must come away in order to disen- 

 gage the farther ends of the blowpipes, which are fixed 

 in it. This wall must be carefully built up again, after 

 the new blowpipes have been introduced and fastened 

 to the roaster. 



Of the Steam-tube. 



This is an essential part of the machinery of a roaster, 

 and must never be omitted. It should be situated some- 

 where in the upper part of the roaster, but it is not 

 necessary that it should be placed exactly at the top of 

 it. It might perhaps be thought that a hole in the 



