Unidentified photographer / artist, 1881, Photographic head-rest, Book illustration, Google Books, LL/34663
Unidentified photographer / artist 1881 Photographic head-rest
Book illustration Google Books Published in "Knights American Mechanical Dictionary" by Edward Knight, Vol.II - GAS-REA, (Boston: Houghton, Mifflin and Company, 1881), fig.3679, p.1682.
