| Unidentified artist Improved Camera Obscura, For the Instruction of Youth in the Art of Drawing & Coloring 1819-1820 Flyer, detail Private collection of Jack and Beverly Wilgus LL/88447 The flyer appears to date from near 1819/1820. London Magazine from 1819 is quoted and it does not mention that painter Benjamin West, who died in 1820, is deceased.
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