Using literary data the comparison of the position angles (PA) of
elongated structures and of the polarization vector E of 2, 4
and 6 cm emission of compact source 3C 84 was carried out.
It was shown, that in 1972-1984 vector E revealed two
primary directions with PA = -10
and PA = +17, which
correspond to the directions of two main elongated structures of
the radio source, including the mildly relativistic parsecscale
ejection. Parallel direction of polarization vector and curved
radio jet of 3C 84 source agree with the model of distribution of
magnetic fields and knots of relativistic electrons emission in
mildly relativistic ejections of BL Lac objects, considered by
Gabuzda et al. (1994). In the case of 3C 84 this model must be
complicated because its radio jet changes the direction under the
influence of external magnetic field.
(submitted as poster contribution)