Left: Gustav F. Ernst. On the Application of Suitable Mechanism to a Case of Amputation of Both Hands. London: Sprague & Co., 1893: n. pag. Courtesy of the Wellcome Library, London. Right: Gustav F. Ernst. On the Application of Suitable Mechanism to a Case of Amputation of Both Hands. London: Sprague & Co., 1893: n. pag. Courtesy of the Wellcome Library, London.
