70 



VINEGAR, CIDER, AND FRUIT-WINES. 



in Figs. 17 and 18 can be recommended. The iron heating cyl- 

 inder, which is provided with the feeding-door H and the air- 

 regulating door A, stands in a vault beneath the centre of the 

 room to be heated. It is surrounded on all sides by the sheet- 

 iron jacket J/, reaching from the floor of the cellar to the top of 

 the vault. In the vault is a circular aperture, 0, for the reception 

 of the channels C and <7 r The latter, ascending slightly, run 



Figs. 17,18. 



P P 



Ground-plan and Elevation of Heating Apparatus. 



along the centre of the room to be heated. Above they are cov- 

 ered by cast-iron plates, P, and by pushing these plates apart or 

 substituting a lattice plate for one of them in any part of the 

 channel, warm air can be admitted to the room. If the room is 

 to be heated without renewing the air, the register in the flue L 

 which communicates by a flat iron pipe with the lower part of 



