352 On the Construction of Kitchen 



to its iron rim by being turned over its outward edge ; 

 and in order that the copper, thus turned over the out- 

 ward edge of the iron rim, may hold fast without pro- 

 jecting below the level of the lower flat surface of the 

 ring (which would be attended with inconvenience), the 

 lower part of the outward edge of the ring must be 

 chamfered away in the manner represented in the 

 following figure (26), which shows a vertical section of 

 the ring, of the full size, with the copper turned over it. 



Fig. 26. 



The upper inside edge of this iron ring may be 

 rounded off, as it is represented to be in the above 

 figure. In this figure the section of the ring is dis- 

 tinguished by diagonal lines, and that of the copper 

 (which is turned over it) by two parallel crooked lines. 



When stewpans and saucepans are constructed on 

 the principles here recommended (with flat circular 

 iron rings), an advantage will be attained, which in 

 many cases will be found to be of no small impor- 

 tance : they will be well adapted for being used in small 

 portable fire-places heated by charcoal, or in portable 

 stoves heated (or rather kept hot) by heaters. Descrip- 

 tions of these portable fire-places and heater-stoves will 

 be given in the sequel of this work. 



As the upper part of the circular opening of the fire- 

 place (Fig. 27), on the top of which the lower part of 

 the circular rim of the saucepan reposes, is nearly on 

 a level with the top of the solid mass of the brick-work, 



