Abstract: The waste incinerating system of Nichols U.S. Pat. No. 3,905,312 issued Sep. 16, 1975 is improved to prevent decreases in combustion temperature to an extent such that there is a danger of flame-out and consequent choking of the furnace chamber with wastes fed into such furnace chamber for incineration. A substantially immediately responsive, radiation sensing control, normally in the form of a standard radiation pyrometer focused on a radiation-responsive target in the furnace chamber, is incorporated in the system to augment fuel supply substantially immediately when required.