Charcoal: Charcoal is a solid fuel and the very best fuel for heating purposes.
He saw that under stress of intense heat the solid fuel emitted streams of gas which burned with great brilliancy.
Gaseous fuel is more manageable in every way than solid fuel, and is far more easily and reliably conveyed from place to place.
In the kiln house there is a test kiln adapted for solid fuel and gas.
The instant and great rise in temperature of the furnace, and the greater stability of the solid fuel used, are extraordinary.
No crude combustion of solid fuel can give ultimate perfection.