Black and white crayon physiognotrace portrait of John Adams done in Philadelphia by the French émigré artist Charles Balthazar Julien Fevret de Saint-Mémin. The portrait is on pink paper, measuring 21⅜″ × 15⅛″, with the above inscription on the back. The “physiognotrace” or mechanical instrument used as an aid for tracing profiles is described in detail by Howard C. Rice Jr. in “Saint-Mémin's Portrait of Jefferson,” Princeton University Library Chronicle, 20:191–192 (Summer 1959).
Courtesy of the Metropolitan Museum of Art.