Kingston 3-colour additive projector. Hahn Goerz projector, on pedestal stand, arc lamphouse. Modified for 3-colour projection. Special mirror and condenser system illuminate 3 frame gate, Rotating segmental colour filter with red, green and blue sections arranged so that as each frame is projected three times in succession the appropriate colour is behind the gate. Three projection lenses. Two Beck projection lenses F: 120mm, 1 Fluor C lens on extension tube made from Raynol lens barrel. Beck prism system used to increase separation of optical paths to lenses. Made to design patented by Arthur Kingston and haworth Booth.