[Remark: the extinguisher known as the Lux fire extinguisher system was first demonstrated on a gasoline fire.] Shot of man trying to extinguish fire with an ordinary extinguisher, then succeeding with the Lux apparatus. Shot of fire in small wooden shack, of fire in pans on ground being put out by the Lux extinguisher. Shot of fire in tank full of a mixture of oil and gasoline being put out by the Lux apparatus.