(en) « William's journal reveals that the pair made use of a camera obscura, an optical device used as an aid in drawing which reduced the time it took to sketch a scene and increased the realism of their work. » — Artist of the Month - September 2008 : Thomas Daniell RA (1749-1840) - Royal Academy of Arts Collections
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(en) Dominique Raynaud, A Critical Edition of Ibn al-Haytham’s On the Shape of the Eclipse. The First Experimental Study of the Camera Obscura, Springer, (lire en ligne)
