It is pointed out that there is a difference between the electromagnetic field behaviour at the edge of a highly conducting wedge of angle greater than π (as predicted by Meixner) and the known field behaviour for a perfectly conducting wedge of the same angle. In particular, the perpendicular electric fields are infinite in the first case and finite in the latter. A careful examination of the theory suggests that Meixner's effect is real, but is only detectable in practical conductors if the wedge angle is very accurately machined.