Improvements in Catoptric Light Apparatus.

Abstract

Abstract 28,297. Bloudel, A. Dec. 7. Lighthouse and like lamps.-In apparatus for producing two or more revolving beams from a single light source a comprising a concave reflector b and two or more inclined plane reflectors c, d which rotate about a vertical axis, the reflectors c, d are so arranged that the axes of the issuing beams of light make unequal angles with each other in an horizontal plane. The reflector b is preferably parabolic, and the light source a is placed at its focus. The reflectors c, d, Fig. 1, form a wedge and are bounded by an imaginary cylindrical surface passing through the periphery of the reflector b. When three reflectors c, d, d<1>, Fig. 2, of equal area are employed, their point of intersection is outside the axis of rotation. The reflectors c, d are supported on a plate m which may revolve on rollers, or be carried by a shaft with a footstep bearing, or may form part of a float in a water or mercury bath. The light source a and the reflector b may also be rotated. An aperture t is provided in the reflector b for the passage of combustion products.

Inventors

• 👤 Andre Blondel

Bibliographic Details