Abstract: Apparatus and method for manufacture of bell-shaped, air core armatures for fractional horse power electrical d.c. motors. A metal wire is wound on a slantingly in relation to the armature axis uninterruptedly in such a way as to form triangular equal-sided conductor fields. For winding, the wire is led around the outer edges by two guiding devices of which one is arranged at the upper end, and the other at the lower end of a rotable cylindrical auxiliary device. The windings are staggered with respect to each other by 180.degree. electrically. One turn of the winding is placed next to the other until the armature winding is completed. The apparatus includes a cylindrical auxiliary device with tape-like guiding means clamped on the surface of the device or mandrel, the guiding means extending tangentially in relation to the mandrel cylindrical surface.