Abstract: A method for the fabrication of an iron member with a winding for generation of electromagnetic fields. The iron member has essentially a square-shaped iron core (6) and at least one U-shaped iron yoke (7) receiving a segment of the winding; the iron core is inserted between the legs of said U-shaped iron yoke. The iron core (6) is introduced into the winding having to begin with undeformed wires and subsequently the U-shaped iron yoke (7) is slid on. Herein core (6) and yoke (7) are moved so far against each other, that the cross-sectional area of the groove bounded by the core (6) and the yoke (7) or of the winding space becomes smaller than the cross-sectional area of the segment of the winding which it to begin with not deformed and received by the winding space of the iron member formed by the core (6) and the yoke (7).

Abstract: A fluorescent lamp fires more quickly at low temperature and its service life is lengthened if the input terminals of a full-wave rectifier are connected to the lamp electrodes and a resistor and capacitor are connected in parallel circuit between the output terminals of the rectifier. The voltage pulses applied to the electrodes prior to firing are reduced in peak amplitude and broadened by the improved circuit.