Marey sphygmograph with unusual pressure adjustment based on rack mechanism

Made:
1880-1930 in London and Paris
maker:
Hawksley and Sons Limited
and
Bréguet
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.