Philip W. Cassil, New Athens, O.--To the top of the furnace or firebox
is secured the ring heating chamber, which consists of the ring plate
having a ring flange or rim formed around its outer edge. To the ring
plate are attached the outer ends of a number of arms, the inner ends
of which meet in the center of the ring plate, and have a journal
attached to them. The journal may be hollow or solid, and upon it is
placed a hub to which are attached a number of radial arms, to the
outer ends of which is attached a rim. The rim fits against the
inner part of the ring plate, and forms the inner wall of the heating
chamber.