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All-British answers aperture diameter apertures whose diameters Arnolds AUTOTYPE British zinc Cape Town celluloid clamp clove oil colour photography congratulated copy cosine cost customers cylinder Diagram distance and angle drier Dublin duced ELECTROTYPING endeavour engraving machine etching exposure extension of 36 FARRINGDON FARRINGDON ROAD Federation film focal length formula Free Sketch Gateshead gelatine GLUE half-tone blocks Howey Hunter-Penrose hydroquinone Ilford illustrations increased induction stage inking rollers intensity of light invention January Kingsway Kodak Kodaline lamp distance lens London manufactured Messrs metal mounts method mount is available Mounting Process Blocks newspaper obtained oxidization PANCHROMATIC paper photo-engraving photograph pictorial picture plates Pounds Sterling printers printing ink Printing Trade Process Photogram produce recently reproduction retouching screen sensitive surface someone stops stereotyped stop watch STREET studio supplied three-colour tint tion to-day tone value Two-Colour V-shaped engraving tool volatile inhibitor WILLIAM GAMBLE Wratten