b&w photograph Fair condition: sides, corners and edges wrinkled, top edge warped, residue on lower right side, tape on top two corners of reverse and tack holes in each corner. Portrait of five men and one woman watching a demonstration by another man, who is operating some kind of scientific equipment. Written in pencil on reverse: '143.0.' Came in white mat with '143.0' written in pencil on reverse. From Art Gallery.