Abstract: A method of manufacturing a coil having a cross section differing from a circular ring cross section. In this method a circular cylindrical coil with a circular ring cross section is first wound and then reshaped into a coil with a cross section differing from the circular ring cross section. At least two axially parallel fingers of an expander are temporarily inserted into the coil interior for reshaping the wound circular cylindrical coil and are displaced in a diverging relative movement after the insertion and while doing so expand the initially circular cylindrical coil into the coil having the different cross section.

Abstract: A superconducting tunnel element, having a plurality of super conductors separated by barriers, the superconductors each comprising two physically separate but electrically connected superconducting layers and one insulated control layer. As a result, summation of the detection capacity or of the transmitting intensity becomes possible. Also, the simultaneous detection or transmission is permitted on arbitrary different frequencies or a summation of the signal intensity is possible in the case of SQUID-systems.