  We have detected the rare phenomenon of stable, drifting sub-pulse behaviour
in two pulsars discovered in the recent Swinburne intermediate latitude pulsar
survey. The pulsars; PSR J1231-47 and PSR J1919+0134, have approximate periods
(P) of 1.873 and 1.6039 seconds respectively.
  Both pulsars have multi-component profiles, and distinct drifting is observed
across them. We have identified a single drift mode in both pulsars: the drift
rate for PSR J1231-47 being 5.4(1) ms P^{-1} and 5.8(2) ms P^{-1} for PSR
1919+0134. The drifting is linear across the profile with no departure from
linearity at the edges within the sensitivity of our observations.

Astrophysics