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Preliminary VLBA polarisation results on 6 ``blazars'' from 6.5-cm to 7-mmare presented here. Observing at several different wavelengths, separated byshort and long intervals, enabled reliable information about the magnetic (B)field structure to be obtained and for the effect of Faraday Rotation to bedetermined and corrected. For all sources the magnitude of the core RotationMeasure (RM) derived from the shorter wavelength data was greater than thatderived from the longer wavelength data, consistent with a higher electrondensity and/or B-field strength closer to the central engine. A transverse RMgradient was detected in the jet of 0954+658, providing evidence for thepresence of a helical B-field surrounding the jet. The RM in the core region of2200+420 (BL Lac) displays sign changes in different wavelength intervals (ondifferent spatial scales); we suggest an explanation for this in terms ofmodest bends in a helical B-field surrounding the jet.

Investigation of the Faraday Rotation Measure and Magnetic Field Structures of Several AGN Jets on Sub-Parsec to Parsec Scales