Cf: Applied Arts and Industrial Design 1800 - The Present, Museum Boymans van Beuningen, Rotterdam, 1996, p. 94
See also: Catherine McDermott, Twentieth Century Design, Design Museum, London, 1998, p. 149
George Cawardine, a medical doctor, designed for Herbert Terry the first fully articulated desk lamp with a spring tension mechanism based on the ergonomics of the human arm. The example offered is from the first series of production. Lamps produced later in the 1930s featured a modified shade and two-stepped pedestal.