Table 1.

Instruments used for the examination of the arterial pulse.

Instrument	Inventor
Clepsydra	Herophilus (Third century BC)
Pulsilogy	Santorio Sanctorius (Sixteenth-Seventeenth century)
Pulse watch	Sir John Floyer (Seventeenth-Eighteenth century)
Sphygmometer	Jules Herisson (Nineteenth century)
Kymograph	Carl Ludwig (Nineteenth century)
Sphygmograph	Etienne Marey (Nineteeth century)
Hemotachometer	Karl Vierordt (Nineteenth century)
Plethysmograph	Otto Schmitt (Twentieth century)