  We have tested four-point methods of the Hall effect measurement on BiSrCaCuO
(2223) polycrystal and also the validity of the magnetic field form of the
reciprocity theorem. We found that different types of determination of the Hall
resistance using various combination of measured resistances provide different
value of it. We have separated two parts of the resistance combinations, which
are even and odd in magnetic field, respectively. The odd part, which is
equivalent to the Hall effect, is equal for all formulae used. The even part of
transverse resistance varies in different formulae. The magnetic field form of
the reciprocity theorem is not valid. Models for explanation of this violation
are also discussed.

Superconductivity