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A. W. Penrose ALUMINIUM FRAME ampere astigmatism attention Auramine Barnet Blocks sent BRITISH BLOCKS camera Canada Balsam Carbon prints cell Committee constant absorptive value Council court Daily Express degree of brilliancy display distance dry colour filters dry filter dust electric motor employed enclosed arc lamp ETCHING FEDERATION OF MASTER firm FIRST-CLASS foot pump fused gelatine glycerine gradation Hall high-light opacity illustrated inches John Swain Kingsway L.C.C. School large number light liquid filter London Marshall Engraving MASTER PROCESS ENGRAVERS Mercury vapour tubes methylene blue Milford Lane millimetre section motor necessary negative objects optically worked glass Panchromatic Plates Penrose's Annual PHOTOGRAVURE Posed Photographs present printers Process Plates promote solubility real practical value scene screen exposure screen sweat screened tissue shewed shewn stand of Messrs Stringer suitable dyes Sun Engraving Swain & Sons testimony three-colour tion TRADE MARK Trichromatic Inks type of illuminant witness Wratten Plates Wratten Process