Keywords: Treatise on Electricity and Magnetism Fig 05.jpg en Lines of forces and Equipotential Surfaces in a diametral section of a spherical Surface in which the superficial density is a harmonic of the first degree A treatise on electricity and magnetism Oxford Clarendon Press Original was http //rack1 ul cs cmu edu/is/maxwell1/ here James Clark Maxwell 1873 Image A Treatise on Electricity and Magnetism Volume 1 473 jpg PD-old A Treatise on Electricity and Magnetism diagrams 19th-century diagrams |