VLBI OBSERVATIONS OF A COMPLETE SAMPLE OF RADIO GALAXIES .3. THE 2-SIDED MILLIARCSECOND STRUCTURE OF 3C-338

We present VLBI and VLA observations of the Fanaroff-Riley ''type I'' radio galaxy 3C 338. On both milliarcsec and arcsecond scales, the sou rce is characterized by emission on both sides of the core. In the VLB I images, the symmetric structures have three or four ''knots'' in the emission on each side of the core. The reliability of the VLBI images was extensively tested using two different data reduction procedures. Detection of equally bright emission on both sides of a parcsec-scale core implies that Doppler boosting is small: either the source orient ation is near the plane of the sky, or the twin jets are not highly re lativistic. Another possibility is that the jet is intrinsically one-s ided and alternately feeds energy into opposite directions.