  It is pointed out that the underlying reason why the magnetic force is
similar to a Coriolis force is that it is caused by Thomas rotations, induced
by successions of non-collinear Lorentz boosts. The magnetic force may even be
viewed as a kind of Coriolis force (making perhaps more acceptable the apparent
non-existence of magnetic monopoles). We also show that under a change of
inertial frames, Faraday lines of force Lorentz contract as if 'etched' in
space, while 'Coriolis' terms get added on.
