| C. Gobrecht, Sc / J. Farey Junior, delin Camera obscura [Optics, Plate III] n.d. Engraving Private collection of Jan Weijers (Servatius) LL/45792 Published in Abraham Rees, The Cyclopedia; or, Universal Dictionary of Arts, Sciences, and Literature (Philadelphia, 1805-22), vol.4, plate 3.
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