noun. An instrument for the determination of the magnetic induction in iron, or the permeability, by means of the tractive force across a gap or joint in the magnetic circuit.

noun. A device used measure the permeability of a fluid (e.g., water) through a porous material.

noun. An instrument used to measure the electromagnetic permeability of a material.

"Thomson double bridge, the Koepsel permeameter, the Duddell double projection oscillograph, the Station photometer with Lummer-Brodhun screen, the Carey-Foster bridge and others."

drysdale's permeameter  esterline's permeameter  ewing's permeameter  koepsel's permeameter  picou's permeameter