MULTIPLE UNIT STOVE 



ADAPTATION TO LOCATION AND USE 



The multiple unit is a massive structure which 

 has, with rare exceptions, no reason for exist- 

 ence on a national forest, and is in reality a 

 camp stove adapted only to picnic area use. 

 This type of multiple unit is of greatest value in 

 connection with areas used intensively and by 

 large organized picnic groups. It has little 

 value on areas used for small family picnics, 

 or on campgrounds. 



It may be used in multiples of two, three, or 

 four, as shown in figure 1. The most practical 

 design is in multiples of two, which greatly 

 reduces the congestion around the cooking 

 space. 



It is very seldom that a multiple unit of 

 this kind would be used by campers, except 

 those who live at resorts, in connection with 

 which there are small cabins constructed 

 close together. 



This type of stove in multiple units is excel- 

 lently adapted to some of the areas where 

 there is intensive activity in winter sports. 



DESIGN AND CONSTRUCTION 



The foundation under these structures should 

 extend below the frost line and the hearth 

 should rest on a masonry fill. The hearth and 

 the firebox should be paved with fire-clay 

 brick. 



The efficient design of these units requires a 



minimum length for the firebox, and a narrow 

 entrance to the flue, creating a considerable 

 additional warming area, as shown in figure 

 3. Under this type of design, the flames and 

 the hot gases are forced through the narrow 

 passage over the shelf which is directly under 

 the cooking top, thus making the entire surface 

 of the cooking top available for use. 



In this drawing, a 10-gage iron top is indi- 

 cated, reenforced with 1 by 1 inch angle irons 

 welded to the undersurface as shown. The use 

 of a thinner gage may cause buckling and 

 sagging, and to date the information concern- 

 ing this problem is not sufficiently adequate to 

 determine the result which would occur by 

 using any thinner material. 



The high chimney may have a terra cotta 

 flue lining, although fire-clay brick will serve 

 equally well. Sometimes the single flue is made 

 sufficiently large to meet the requirements of 

 the multiple units which it serves and it should 

 then be divided into the required number of 

 smaller flues of the proper size. This encour- 

 ages a more efficient operation by shutting 

 out the cold air which would otherwise be 

 drawn from the stoves not in operation. 



VARIATIONS IN DESIGN 



Sometimes an ash pit may be constructed under 

 the firebox, as indicated in figure 5 and as 

 shown in plate XII, figure 4. 



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