Self-registering
Pronunciation : Self`-reg"is*ter*ing
Part of Speech : a.
Definition : Defn: Registering itself; -- said of any instrument so contrived as to record its own indications of phenomena, whether continuously or at stated times, as at the maxima and minima of variations; as, a self-registering anemometer or barometer.
Source : Webster's Unabridged Dictionary, 1913