The prismatic ring or plate is a new contribution to optical science,
and was designed for use in a machine for the transmission of radio
pictures from a flat surface, and for recording them on a flat surface,
the only way in which radio vision and radio movies will ever be
produced; and a method which permits of the reception of portraits
having true photographic value, without lines, and having tone and
shading unequaled by any other known process to date.
The prismatic ring section is ground into the face of a glass disc, and
from one end to a point half around it has its base outward, and from
this midway point around to the other end having its base inward. The
warp from one end to the other is gradual.
A beam of light passing through this ring, in rotation, is caused to
oscillate, having its hinged action fulcrumed in the plane of rotation
of the prism ring. The oscillation is always in the plane of the
diameter of the disc from the point where the light passes through the
prismatic ring section.
The plates (made with the initial grinding machine) may have one, two,
or four prismatic sections to the ring, and may be made right or left
hand, and in 10 inch and in 7 inch sizes, and also in disc ring (first
illustration) or band ring form (second illustration).
[Illustration: [Photographs]]
[Illustration: [Photographs]]