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A. J. Bull achromatism acid ammonium Answer aperture Award beauty blocks British brush Cascade Cascade Tunnel caused chemical claimed Clerkenwell coat colour print Columbia River Highway continuous tone COPPER crayon defect developments diaphragm dry plate E. L. Turner Elliott & Sons enamel lifting experience Farringdon Federation field fish glue folder gauge gelatine give glue graphic half-tone highest lights Hilite ILFORD illustrations Intaglio interesting iris diaphragm iron Kodak lakes lens Litho LONDON lunch method miles Mount Hood mountains negative newspaper nitric acid offset printing paint PANCHROMATIC papers passed perchloride plate-makers portion Prescot printer printing frame Printing Plates PROCESS ENGRAVERS Process workers produced Pyramid Lamp QUEEN VICTORIA STREET Question rays reproduction requirements rotagravure press rotary Royle screen Seattle shadow sheets shew solution stop suitable surface THREE-COLOUR tion trip trouble usual various View of Mount volume warm weather wash Whirl William Gamble zinc