C The funnel.
B The false back and closing.
E True back of the chimney.
T Top of the fire-place.
F The front of it.
A The place where the fire is made.
D The air-box.
K The hole in the side-plate, through which the warmed air is discharged out of the air-box into the room.
H The hollow filled with fresh air, entering at the passage I, and ascending into the air-box through the air-hole in the bottom plate near
G The partition in the hollow to keep the air and smoke apart.