exceptional 1930's largely intact exterior builsing facade "x-ray" mogul projector floodlight once used to illuminate a "century of progress" 1933-34 chicago world's fair exhibition hall. the oversized electric adjustable spotlight retains the original thick plate glass convex lens secured with a hinged bezel. the spotlight housing is comprised of bronze with naturally aged verdigris finish. the mounting apparatus is a swivel and trunnion type, of rustic cast iron. the interior or internal reflector is silvered-glass with single-zone paraboloidal shape. original incandescent mogul base intact. manufactured by the curtis lighting company of chicago. floodlighting was pioneered by walter d' arcy ryan at the 1915 panama pacific exhibition. his technique was to shine lights on the buildings from a distance, to use reds on corners and, perhaps, green on st. patrick's day. ryan's work would not have been possible without a device that could direct the light's rays on the subject instead of diffusing it uselessly into the night sky. chicago happened to be the home of the man known as the "archenemy of glare" and the "pioneer of indirect illumination," as curtis lighting (formerly the national x-ray reflector co.) referred to its founder, augustus curtis. the company was devoted to the design, manufacture, and installation of engineered lighting equipment which provides the correct amount of illumination for proper architectural and lighting effect. measures approximately 27 inches in height. the diameter is 20 inches.