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 Back of first subject in plate 3 shows the high tight line across back at base of thorax, where the pressure of the wrong corset is greatest as indicated by the arrows, and the normal width of back with normal length of waist of the correct corset in plate 4. This corset has the tendency to straighten the slightly curved spine by pelvic and spinal support, and relief of the pressure around base of thorax.

Increase in lung capacity and expansion of chest and rib walls after three months' wearing of this corset were such that the subject could not wear the incorrect corset worn previously. 