At the end of this series of experiments the direction of maximum polarisation had again become normal to the beam.

The direction of maximum polarisation enclosed, in this case, an angle of 12°, or thereabouts, with the axis of the beam.

A vast amounts of light could be removed from the sky behind it, for it occupied the position of maximum polarisation.

Both alone, and in conjunction with the selenite, it pronounced the perpendicular to the solar beams to be the direction of maximum polarisation.