restoration laboratory of the Markian Museum in Berlin. Its principle of operation is based on the use of convection and heat radiation. Electric heating elements, spaced within 10 mm. of each other, are placed below an anti-corrodal plate. In addition, a stream of hot air can be directed below the heating plate, by the use of a low pressure blower and a heater. The air circulates within a closed system. By the regulation of air-vents and the disconnection of the heat, this system can also be used to cool the heating plate. -- AATA