Sphygmograph in black leatherette case. Made by Verdin belonged to Marey. Sphygmograph in black leatherette case
Sphygmograph by Gardener, owned by Dr. Bruce of Edinburgh, cased, c.1900 Sphygmograph by Gardener 1890-1920
Marey sphygmograph and set case lid, Mahomed's modification, with accessories, in case, by Krohne and Sesemann, London, motor by Breguet, 1875-1900 Marey sphygmograph 1872