Stelmar System spotlight/slide projector. For theatre or large cinema use. With sperry gyrascope co arc lamp Mk IV model 1. Carbons adjusted by concentric interlocking controls. Condenser mirror system with dowser, special design. Sliding plate with vertical and horizontal barn door controls, iris diaphragms and slide carrier. Shutter, controlled from rear of projector. Whole positioned by chain drive from rear end. Sliding lens plate with two lenses, spot and flood on hinged mount. Focused. With filter box with six filters in cyan, yellow, blue, red, magenta and green with string fed from controls on panel above the lamphouse. Filter wheel on front with clear blue, green and magenta discs. Hole and pin sighting device. Counterbalanced, automatic compensation for positioning on slide carrier and lens panel. Preset height adjustment. Rotation on ball race. Locking off handles. Tripod base. J. Frank Brockliss.
Science Museum Collection