Permeameter 3148706 153451309 2007-08-24T23:47:33Z Squids and Chips 2947772 stub sort The '''permeameter''' is an instrument for rapidly measuring the [[electromagnetic]] [[permeability (electromagnetism)|permeability]] of samples of [[iron]] or [[steel]] with sufficient accuracy for many commercial purposes. The name was first applied by S.P. Thompson to an apparatus devised by himself in [[1890]], which indicates the mechanical [[force]] required to detach one end of the sample, arranged as the core of a straight [[electromagnet]], from an iron [[yoke]] of special form; when this force is known, the permeability can be easily calculated. {{1911}} {{electromagnetism-stub}}