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Published online by Cambridge University Press: 04 June 2018
In 1975 the carousel model was proposed by Ruderman & Sutherland to explain the beautiful phenomenon of drifting subpulses. However the simultaneous appearance of subpulse bands which drift in opposing directions - a feature now found in two pulsars - is difficult to reconcile with this model, both geometrically and physically. Here we propose a geometric resolution of this problem which also may shed light on a range of previously baffling phenomena. The model places significant constraints on the underlying physics of pulsar emission.