Marey sphygmograph with unusual pressure adjustment based on rack mechanism

SMG00256826

SMG00256826
Science Museum Group
© The Board of Trustees of the Science Musuem

Marey sphygmograph with unusual pressure adjustment based on rack mechanism, by Hawksley and Sons Limited, 357 Oxford Street, London, England, with motor by Breguet, Paris, France, 1880-1930.