Pneumograph, metal, nickel plated, for recording m

Made:
1871-1900 in Paris
maker:
Charles Verdin

Pneumograph, metal, nickel plated, for recording movement of chest in respiration, with canvas straps and rubber tubing, by Charles Verdin, 7 rue Linne, Paris, France, personal relic of Sir Thomas Lauder Brunton, 1871-1900.