Improvements in or relating to Lanterns or Apparatus for Producing Scenic Effects, Signalling, Displaying Advertisements and like Purposes.

摘要

18,605. Bright, R. Aug. 6. Optical - projection apparatus.- The two parts d', d2 of a double transparent screen are moved simultaneously in front of or away from their corresponding lamps b1, b2 on the actuation of a rod e, to the oppositely screw-threaded portions e1, e2 of which they are suitably attached. The device can be used in projection for advertising, signalling, and like purposes.