34 
HOT-WATER APPARATUS. 
of a pot, and moveable, to allow the fuel to be introduced at the top of the 
furnace. 
The only peculiarities of this chimney, are a circular plate of strong- iron, 
c, nearly as larg-e as the opening- of the furnace, suspended by three rods over 
the fire, and causing- the flame to play against the sides of the boiler, the draft 
takiag-pl ace all round it, and a deep rim of sheet iron about three inches broad, 
in form of an inverted cone, attached at its upper edge to the lid, but leaving- a 
space of about one and a half inch between itself and the circular plate or damper. 
Through this space the draft plays as indicated by the arrows in fig. 1, where the 
top is represented in its place. 
Fig. 3. Fig. 3 represents the frame or base 
on which the boiler is fixed. A ring of 
iron rather broader than the bottom of 
the boiler is attached to a square frame 
of wrought iron, by which it may be 
fixed in the brickwork which supports 
it. The grate G may either rest on 
three brackets x x oc^ and be thrown down 
with an iron hook, or (which is the best 
plan) be fixed on pivots, with a catch to 
prevent it from turning over, except 
when required to clear the furnace. 
Fig. 4. 
Fig. 4 represents the apparatus complete. The lead pipe a from the upper 
union joint of the boiler enters the lower side of the cast-iron pipe A ; and from B, 
the other extremity of the range of iron pipes a lead pipe, 5, also from the lower 
side of the iron pipe, enters the top of the reservoir R. A strong cask answers 
the purpose of a reservoir as well as any thing, though an iron tank, or close cistern 
of very thin copper, would be more durable. From the lower side of this reservoir 
