You searched for: “hydrosphygmographies
hydrosphygmography (s) (noun), hydrosphygmographies (pl)
1. A recording of blood pressure by means of a hydrosphygmograph using water as an index.
2. A sphygmograph in which the pulse beat is transmitted to the recorder through a column of water.

A sphygmograph is an instrument which, when applied over an artery, indicates graphically the movements or character of the pulse.