. Machinery and processes of the industrial arts, and apparatus of the exact sciences. x-ternally. The manner of adapt-ing this plan of heatingto a large oven for thebaking of bread may beunderstood by referenceto the accompanying fig-ures. Fig. 81 is a sectionin elevation of the ovenand furnace; and Fig. 82is a view in plan. Thespiral in the furnace isshown at A directly overthe bars of the grate. Itascends by the tube o,which is external to thefurnace, and is protectedby a sheath of sheet iron,makes a bend at H, whereis attached the COlltri- Marvals Heating Apparatus—section, vance D, (to be
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. x-ternally. The manner of adapt-ing this plan of heatingto a large oven for thebaking of bread may beunderstood by referenceto the accompanying fig-ures. Fig. 81 is a sectionin elevation of the ovenand furnace; and Fig. 82is a view in plan. Thespiral in the furnace isshown at A directly overthe bars of the grate. Itascends by the tube o,which is external to thefurnace, and is protectedby a sheath of sheet iron,makes a bend at H, whereis attached the COlltri- Marvals Heating Apparatus—section, vance D, (to be presently explained,) and then forms a flat spiral B, asshown in Fig. 82, in the roof of the oven, where the coils are distant fromeach other little more than t \e diameter of the tube. From this spiralit is carried again outside of the masonry to the point d, seen in bothfigures; then it descends and re-enters to form a third spiral ee, underthe floor of the oven, which last is formed of thin tiles which are soonheated through. Thence it descends after again passing out through. 348 PARIS UNIVERSAL EXPOSITION.
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