nInductometer(Elec) An instrument for measuring or ascertaining the degree or rate of electrical induction.
Century Dictionary and Cyclopedia
ninductometerAn instrument used by Faraday for measuring the degree or rate of electric induction, or for comparing the specific inductive capacities of various substances, consisting of three insulated metallic plates, placed parallel to and at equal distances from one another, each exterior plate being connected with an insulated gold leaf of an electroscope.
Webster's Revised Unabridged Dictionary
Induct,ion + -meter,
Inductometer, differential, 1307, 1317.
"Experimental Researches in Electricity, Volume 1" by Michael Faraday