Self inductor with means for adjusting self inductance - has wiper contacting winding in slotted threads on rotatable former with plain section

摘要

The insulated cylindrical former can be made to rotate about its axis by a thumb screw. The windings are laid in slots forming screw threads around the circumference. Part of the surface of the former which is free of threading is at the remote end of the windings. A wiper makes contact with the windings in the slots. The spring element is brought near the middle position before the spring contact is broken.