Abstract: For the continuous measurement of the thrust forces produced by the spinning rolls on the workpiece to be extended while the spinning rolls are rotating a measuring rod is provided, which has its one end fixed coaxially on the spindle within a hollow spindle, while its other end projects freely out of the spindle. In the plane of the free end of the measuring rod a distance sensor is arranged, which detects the radial displacement, caused by the radial flexure motion of the spindle, of the measuring rod and computes the force acting on the spinning roll using a processing unit.

Abstract: In an apparatus for rolling the walls of a tube in order to decrease the wall thickness and so increase the length of the tube by the use of pairs of rolls of which one roll is outside the tube wall and the other roll is inside it and in which relative axial motion and relative rotation takes place between the tube and the roll pairs, an increase in the possible length of tube which may be rolled is produced by having all the rollers carried on means extending from a common support structure on which a holder for one end of the tube is also carried.

Abstract: Heat exchangers which, through convection or radiation, are designed to absorb varyingly high energy flow about the circumference of their heat transmission walls. The cross-sectional area of the heat exchanger is subdivided into two or more flow passageways by means of inserts in such a manner, that the temperature differences and thermal stresses in the wall resulting from the high differing energy densities are reduced or even prevented. Achieved hereby is an extensively balanced temperature about the circumference of the heat exchanger wall so as to eliminate injurious thermal stresses.