The Collaborative International Dictionary of English v.0.48:

Self-registering \Self`-reg"is*ter*ing\, a.
   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.
   [1913 Webster]