86 
POLMAISE SYSTEM OF HEATING. 
by the avowal, but really it seems to me impossible to discrimi¬ 
nate between the principle of the old smoke flues, now justly 
consigned to the abyss of oblivion, and that of the all-perfect 
Polmaise system. Oh! but say the advocates of the method, we 
have discovered a means of sifting all gaseous vapours and 
noxious properties from the heated air, through a wet blanket, 
whereas in the old flue it was merely sifted through a four-inch 
brick wall; this reasoning is, to say the least of it, quite unan¬ 
swerable. It would render the subject much more easily under¬ 
stood by your readers, and save me a great trouble in explaining 
it, if you, Mr. Editor, will have a sketch of the apparatus en- 
REFERENCE 
A Gratings of conducting chambers, 
by which the cold air within the 
house is conveyed to the stove. 
B Main conducting chamber. 
C Valve for admitting fresh air from 
the exterior. 
D The stove. 
E Warm air chambers, e opening in 
TO CUTS. 
back wall for the admission of the 
heated air to the house 
F The woollen cloth, extending to 
within 2ft.of either end of house. 
G Steps into the vinery. 
H Water gutter, from which water is 
conveyed by worsted threads to 
the woollen cloth beneath. 
