Engraving, line, with etching: JOHN DALTON F.R.S. - [state lettered before imprint]. / Allen Pinxt. ; Worthington Sculpt. [Manchester: Zanetti and Agnew, 1823]. - After the oil by Allen, 1814, from 1806 to 1940 at the Manchester Philosophical Society. - Portrait, nearly WL seated looking to R, wearing spectacles; right elbow rests on table l., next to pressure vessel and scrolls of paper depicting his atomic symbols. Image 37x27.8cm; sheet 40.6x35cm.