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12 FARRINGDON ammonia amount of light angle Annual answer bank note BARNET Bawtree blue filter blue-green circle BRITISH Calendar for 1934 clear glass Colour Advertising colour separation negatives continuous tone negatives Council dances dryplate E. H. Atkinson Ealing Elliott & Sons etching factors Farringdon Avenue FEDERATION OF MASTER film firms FISH GLUE Fleetway four colour Garratt give glazed roller Glue gradation Gravure green filter GRIMSBY half tone half-tone Hatton Garden Hendon HUNTER-PENROSE hydroquinone and caustic Ilford illustrated indirect method interesting issue Kingsway Kodak Kodaline lamps Linotype Litho LITHOGRAPHY London manufactured meet Messrs offset original panchromatic paper PARATONE Photo PHOTO-ENGRAVING Photogravure Pictorial piece position present Printers printing PROCESS ENGRAVERS Process Photogram produced red filter red square screen negatives screen ruled SILVER NITRATE solution Special Rapid specimens success tion tives trouble Uncoated Paper various volume wet collodion Wratten yellow triangle ZINC