"Pether, Wright, To Philosopher, Black Way, 1768"
William Pether (1731-1821), A philosopher giving the lecture on the Orrery, after Joseph Wright (1756-1793), mezzotint, 1768. Proof on laid paper before the letter, printed by J. Boydell, London. Sheet: 497 x 610 mm. Plate: 487 x 586 mm. Impression laid on paper, trimmed just after the platemark on the lower edge and small margins on the other three edges. Paper abrasions and scratches in the image. Dirt in the margins. Two small tears restored in the upper and lower edges. 
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