Abstract: A torch head is provided for an oxygen-cutting torch machine comprising, in combination, a torch head; a first torch mounted on the torch head for cutting perpendicular cuts; and a second torch mounted on the torch head for cutting at an angle to the perpendicular; the mounting for the second torch having two parallel side shaft members and two parallel cross shaft members, each pivotably attached to the other at spaced locations so as to define a parallelogram swinging means in which the four members move pivotably and in parallel together; the second torch being pivotably mounted to one of the side members so that the second torch can be positioned at an angle to the perpendicular according to the relative movement of the parallelogram members; a reciprocably movable drive means mounted on the torch head for swinging the parallelogram swinging means; a shaft member rotatable about a point fixed to the torch head and having two spaced pivot mountings, one on each side of the fixed point, one pivot mounting b

Abstract: Disclosed is an improved catalyst having a high thermal stability including a solid catalyst support having a layer of catalytically active carrier material, either as a coating on a non-catalytically active support or as particles of catalytically active carrier material, and a catalytically active metal component upon the carrier, wherein the improved aspect resides in between about 0.2 and 15% by weight of zinc in the form of zinc oxide contained in the catalytically active carrier material. Also disclosed are a method for preparing the improved catalyst and a method for utilizing the catalyst for purifying automobile exhaust gas and industrial waste gas.