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Lyne & Manchester (1988) identified a group of some 50 pulsars they called"partial cones" which they found difficult to classify and interpret. They werenotable for their asymmetric average profiles and asymmetric polarizationposition-angle (PPA) traverses, wherein the steepest gradient (SG) point felltoward one edge of the total intensity profile. Over the last two decades, thispopulation of pulsars has raised cautions regarding the core/cone model of theradio pulsar-emission beam which implies a high degree of order, symmetry andgeometric regularity. In this paper we reinvestigate this population "partialcone" pulsars on the basis of new single pulse polarimetric observations of 39of them, observed with the Giant Meterwave Radio Telescope in India and theArecibo Observatory in Puerto Rico. These highly sensitive observations help usto establish that most of these "partial cones" exhibit a core/cone structurejust as did the "normal" pulsars studied in the earlier papers of this series.In short, we find that many of these "partial cones" are partial in the sensethat the emission above different areas of their polar caps can be (highly)asymmetric. However, when studied closely we find that their emissiongeometries are overall identical to core/double cone structure encounteredearlier-that is, with specific conal dimensions scaling as the polar cap size.

Toward an Empirical Theory of Pulsar Emission. IX. On the Peculiar Properties and Geometric Regularity of Lyne & Manchester's "Partial Cone" Pulsars