FARADAY EFFECT. Faraday observed in 1S45 that. if a beam of plane polarized light is passed through a hollow iron rod forming the core of an electromagnet. the plane of polarization (see 1.1w•r) is rotated when the current is passed around the Mix forming the magnet. The rota tion is in the direction of the current in the helix; that is. it obeys the 'right-handed screw law.' The amount of the rotation varies greatly with the material which occupies all or part of the hollow iron core, and is proportional to the intensity of the magnetizing current.
Both the Hall and Faraday effeets are evidences of the rotatory action around a magnetic field of force.
Binr.tounAeuv. While the bibliography of elec is extensive, the subject will he found tulle treated in the larger text-books of physics. Of the reference books dealing exclusively with elec tricity and magnetism the following are recom mended, and for the convenience of the reader are grouped in three :•asses: Mathematical and . I draared Treatises: Clerk
Maxwell. Electricity and Ilartnetism (2 vols., Lon don, 1SRI ) Webster. The Theory of Electricity and 1/agnctism (New York, 18971; Thomson.
Notts on Itcetnt Researches in Electricity and .11agnet ism (London, 1S93) El, men tary Text-Books : Thomson, Elements of the _Vat !Irma! kat Theory of Electricity and Magnetism (London. 1895): ;erard, Electricity and Magnetism, translated by Dunean ( New York. 1897).
Elementary and llescriptire Per kins. Outlines of Electricity and Magnc I ism New Yuck. 1896) Thompson. Elementary Lc sans in Electricity and Magnetism (London, 1.891) ; Gordon, Physical Treatise on Electricity and Magnetism (2 vols., London, ISS:i