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action of light appeared artist bath Beaumont Newhall beautiful building calotypes Camera Obscura Castalia cause chemical china chloride of silver cloisters coloured rings Countess of Salisbury Daguerre Daguerre's Daguerreotype delineate depicted discovery effect employed executed experiments exposed fac-simile fixed formed FOX TALBOT George Eastman House glass Henry Henry III impressed instrument invented invisible invisible rays iodide of silver lace Lacock Abbey laid leaf lens LONGMAN ment method negative image Niepce nitrate of silver objects obtained original Oxford Pencil of Nature Photographic Art photographic pictures placed positive image present plate preserved prints produced published QUEEN'S COLLEGE remarkable repre result return to England Royal Society scene seen sensitive paper shadow sheet of paper Sherington silver chloride silver halides solar light solution of salt specimen statue stroy sunshine Talbotype Establishment thought tint tion trace turned dark view is taken washed WESTMINSTER ABBEY Wiltshire