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55 screen reproduction acetic acid adver advertising Annual Meeting Answer ARC LAMP Artist BARNET blocks BRITISH ISINGLASS bromide paper camera extension chemical clean coarse screen collodion collotype colour considerable copper deep-etch process deep-etched plates Direct-Mail dot correction ducing Edward Swann emulsion enlarged etcher extended corner stops FARRINGDON Federation fixed scale flash exposure Garratt give glue half-tone highlight HUNTER-PENROSE Ilford interesting Kimbers Supplies Service KINGSWAY KODAK Kodaline Lamp lens light lines per inch LITHOGRAPHIC London Manufacturer measured Messrs method minutes newspaper obtained offset OXFORD STREET Panchromatic Plates Photo photo-engraver photographic possible price cutting Printer printing Process Club process engraver Process Photogram produce question range of tones reduced result ROUTER screen distance screen negatives screen positives screen ruling sensitive sent shadow dot Silver Nitrate slide slide rule smaller stop specimens stain Stoneware suitable tell three-colour tints tion trade wet plate Wratten Safelights zinc