Appendix B: Notes on individual sources

B0050+402: A total intensity map has already been presented by Gregorini et al. (1998); here, we have added the polarization data. Both lobes are only weakly polarized.

B0109+402: This source is also known as 3C35 and is a fat double radio source (e.g. Jägers 1986). We have detected the core. The complicated polarization structure in the northern lobe results from a rapid change of the polarization angle with position, causing beam-depolarization (see the higher resolution maps of Jägers 1986).

B0157+405: This source has been barely detected in our observations. We find a spectral index of $-0.99 \pm 0.04$ between 325 MHz and 10.5 GHz, which is indeed rather steep.

B0211+326: This source is well detected in both total power and linearly polarized emission; the direction of the observed E-field is perpendicular to the radio axis in both lobes, as is usually found in the lobes of FRII-type sources.

B0309+411: This is a strongly core dominated giant radio source (de Bruyn 1989). Indeed, our radio map is dominated by the core emission as well. The faint extension towards the north-east is an artefact due to the beam.

B0648+733: This is one of our largest sources. The angle of the observed E-field is perpendicular to the radio axis in the south-west lobe, and parallel in the north-east lobe. Considering the high frequency of these observations, it is unlikely that this is caused by Faraday rotation and this configuration therefore must be internal.

B0658+490: This source has a strange morphology (see Paper I). Here, only the compact central components are well detected. The core is unpolarized at our sensitivity, the other two components have an observed E-field parallel (middle component) and perpendicular (western component) to the radio axis.

B0813+758: This source displays a rather dominant radio core at 10.5 GHz. Of the two lobes, only the western one is detected in linearly polarized emission.

B1209+745: The luminous central core/jet structure (see van Breugel & Willis 1981) is unresolved. Polarized emission has been detected at the position of the jet and towards the southern lobe.

B1213+422: The radio core of this source is quite bright at 10.5 GHz. No significantly polarized features are detected.

B1309+412: The total intensity map of this source has already been presented by Gregorini et al. (1998); here, we display the polarization data. Linear polarization has been detected in both lobes, with observed E-fields parallel to the radio axis.

B1312+698: This source is well detected in polarized emission, with an observed E-field direction perpendicular to the radio axis. The unresolved polarized feature in between the two lobes may be a signature of a jet.

B1426+295: The total intensity map shows the two radio lobes and the core of this large source. The E-field direction of the polarized emission in the two lobes is perpendicular to the radio axis.

B1450+333: This is one of the "double-double'' radio sources presented in Schoenmakers et al. (2000b). The resolution of these observations is too low to investigate the properties of the inner structure in detail. However, we find polarized emission towards the inner structure. Polarized emission has also been detected towards both outer radio lobes, with E-field directions perpendicular to the radio axis.

B1543+845: In total intensity this source looks like a normal FRII-type radio source. In polarized emission, only the northern lobe of this source is detected, with the E-field directed perpendicular to the radio axis.

B1626+518: The contour map shows the two lobes and the relatively bright radio core of this source. Also polarized emission has been detected in both lobes.

B1918+516: Both lobes and a radio core are detected, although the latter is somewhat confused with a nearby source. Polarized emission has been detected towards both radio lobes, with E-field directions almost perpendicular to the radio axis.

B2147+816: The radio core and the two extended lobes of this 3.7 Mpc large source are well detected. Polarized emission is detected towards both radio lobes, with E-field directions almost perpendicular to the radio axis. The southern lobe shows signs of a change in the orientation of the polarization angle at its southern edge.

Figure B1: Radio contourplots from the 10.5-GHz Effelsberg observations of the sources B0050+402, B0109+492, B0157+405, B0211+326, B0309+411 and B0648+733

Figure B2: Radio contourplots from the 10.5-GHz Effelsberg observations of the sources B0658+492, B0813+758, B1209+745, B1213+422 and B1309+412

Figure B3: Radio contourplots from the 10.5-GHz Effelsberg observations of the sources B1312+698, B1426+295, B1450+333 and B1626+518

Figure B4: Radio contourplots from the 10.5-GHz Effelsberg observations of the sources B1543+845, B1918+516 and B2147+816