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45 marks acid advantages arc lamps autochrome avoided bichromated gelatine blue carbon Carbro chemicals CLAMPED BOARDS Clerkenwell coating colour filters colour photography colour records colour separation negatives colour transparencies convex COPPER copy cylinder dark room Describe designs submitted developed enamel enclosed arc etched plate Etcher EXAMINATIONS IN PHOTO-ENGRAVING exposures finger flat gelatine film Gilbert Colour Camera giving half-tone Hand Engraving Ilford illumination illustrated industry lens letterpress printer lighter tones line blocks Lithography London MACHINERY machines MASTER PROCESS ENGRAVERS metal methods minutes etching open arc orthochromatic Panchromatic paper Patents Photo-Lithography photo-offset printer photographic plate is sensitive Post free printing surface prism Pyramid Lamp question red rays Rotary Photogravure Router saving screen sensitive plate sensitive to red silver slips spectrogram spectrum strip film SUN ENGRAVING Three-Colour tion type of lamp ultra undercutting action United Kingdom vacuum frame violet Watford wet plate negative WILLIAM GAMBLE