KYMOGRAPH
kymograph, cymograph
(noun) scientific instrument consisting of a rotating drum holding paper on which a stylus traces a continuous record (as of breathing or blood pressure)
Source: WordNet® 3.1
Etymology
Noun
kymograph (plural kymographs)
A device that gives a graphical representation of a variation in a phenomenon such as blood pressure over time, using a pen on a rotating drum.
Source: Wiktionary
Ky"mo*graph, n. Etym: [Gr. -graph.] (Physiol.)
Definition: An instrument for measuring, and recording graphically, the
pressure of the blood in any of the blood vessels of a living animal;
– called also kymographion.
Source: Webster’s Unabridged Dictionary 1913 Edition