Print from engraving of John Dollond, 1830-1839

Print, engraving, stipple, John Dollond, "From an original picture (oil by Benjamin Wilson) in the Royal Observatory, Greenwich.","Under the Superintendance of the Society for the Diffusion of Useful Knowledge". Plate from Gallery of Portraits / C. Knight, 1834-37, engraved by James Posselwhite, overall: 22x19cm., image 12.7x10.1cm. Portrait of John Dollond, HL looking R, seated at table, holding achromatic prism in l. hand. Ref: Wellcome, 832.3; Woodcroft, Gallery, 84 ; O'Donoghue (wrongly cites as Peter Dollond).