�y��vlog

The most recent piece of evidence is a fired clay tuyére - this is the clay used to hold bellows in a furnace.

To prevent t from being burned away it is hollow as at s, and two pipes p and p′ connect to the water-tank w, thus maintaining a circulation of water through s; v is simply a valve or damper to shut off the supply of air from the �ٳܲ�è����; d is the opening to the chimney c.

In cases where the fire requires to be built farther out from the chimney wall than the location of the �ٳܲ�è���� permits, it may be built out as follows:— Fig.

If the cinder begins to settle into the �ٳܲ�è����, your furnace is cold.

Then the �ٳܲ�è���� comes loose with a few strokes of a pull bar.