Zander's knee-flexing machine. A. Levertin, Dr. G. Zander's Medico-Mechanische Gymnastik (Stockholm: P. A. Norstedt, 1892).

From The body electric: how strange machines built the modern American by Carolyn Thomas de la Peña

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Zander's knee-flexing machine. A. Levertin, Dr. G. Zander's Medico-Mechanische Gymnastik (Stockholm: P. A. Norstedt, 1892).
  • Fig. 11. Zander's knee-flexing machine. A. Levertin, Dr. G. Zander's Medico-Mechanische Gymnastik (Stockholm: P. A. Norstedt, 1892).