Abstract: A method of curing a non-metallic band impregnated with resin, which is wrapped about a leg portion of a magnetic core such that it overlaps a portion of itself, including the steps of tensioning the band, curing resin in the overlapped portion, and subsequently curing the remainder of the resin in the band in an oxygen-free atmosphere.

Abstract: Electrical inductive apparatus including a non-metallic band for containing a magnetic core of electrical steel plates. The non-metallic band includes one or more layers of non-metallic tapes or web belts that encircle a core limb and attach to themselves by a non-metallic fastening means. When multiple layers are utilized, each layer is fastened such that all layers are subject to uniform predetermined tension.

Abstract: New and improved magnetic cores for electrical inductive apparatus, and new and improved methods of constructing electrical apparatus, which facilitate the manufacture of such apparatus. The new and improved magnetic cores are of the stacked type, and they utilize different step-lap joints between selected yoke and leg members of the magnetic core. The new and improved methods include the steps of prestacking the leg members, stacking the bottom yoke member while the legs are substantially horizontally oriented, starting at one side of the leg members and progressing to the other side, and stacking the upper yoke member while the legs are substantially vertically oriented, starting from substantially the midpoints of the leg members and progressing outwardly in opposite directions.

Abstract: New and improved magnetic cores for electrical inductive apparatus, and new and improved methods of constructing electrical apparatus, which facilitate the manufacture of such apparatus. The new and improved magnetic cores are of the stacked type, and they utilize different step-lap joints between selected yoke and leg members of the magnetic core. The new and improved methods include the steps of prestacking the leg members, stacking the bottom yoke member while the legs are substantially horizontally oriented, starting at one side of the leg members and progressing to the other side, and stacking the upper yoke member while the legs are substantially vertically oriented, starting from substantially the midpoints of the leg members and progressing outwardly in opposite directions.