Abstract: The apparatus comprises a pair of opposed coil assemblies between which a workpiece to be heated is moved, each coil assembly including a plurality of loop windings arranged generally in a plane parallel to the plane of movement of the workpiece between the coil assemblies, the windings being arranged in pairs with the windings in each pair being aligned transversely in the direction of movement of the workpiece, adjacent end portions of the windings of each pair being turned to extend substantially perpendicularly to the plane of the remainder of the windings and away from the plane of movement of the workpiece. The arrangement allows the width of the coil assemblies to be altered in dependence upon the width of a workpiece to be heated.

Abstract: Transverse flux heating of strip material is effected with a flux distribution having a low value near the margins of the strip and rising substantially uniformly inwardly from the margins to a central peak value for narrow strip or two peaks with a central lower flux region for wider strip. Constructions of pole pieces to achieve the required flux distribution are described.