title: Pulsar sub-pulses and the emission process.
abstract: This article describes another regular phenomenon in the sub-pulse behaviour of pulsars. The drift speed of successive sub-pulses follows a sawtooth pattern with a linearly increasing drift speed and sudden jumps as the speed drops to repeat the cycle.
authors.affiliation: Mullard Radio Atsronomy Observatory, Cavendish Laboratory, Cambridge.
authors.forename: T W
authors.initials: TW
authors.lastname: Cole