A French device for attempting to use tension and recumbency to correct curvature of the spine. The author of “Orthopraxy" notes that the mechanics of the device are meticulously made and very impressive, but ineffective. To correct lateral curvature of the spine, pressure must be applied to either side of the deformed area, to encourage the body to grow into a more correct form.
Orthopraxy: the Mechanical Treatment of Deformities, Debilities, and Deficiencies of the Human Frame. Henry Heather Bigg, 1877.