Patent for a new and improved dry-kiln furnace. This design has "a grate at its forward end, a bridge-wall extending upwardly from the lower side at the rear end of the grate, a smoke-outlet in the bottom between the rear end and bridge, and a transverse flue under the furnace, open at each end and dividing the draft at the smoke-outlet, said flue communicating with the interior of the drying-chamber, and having a vertical baffle-plate under the smoke-outlet extending longitudinally along its bottom in each direction from said outlet, arresting the rotary motion of the products of combustion" (lines 24-36).