generally accepted for larger extensions. See, e.g., Paul Flory's comments in Proc. Royal Soc. A. 351, 351 (1976). Reissued: Electromagnetism William Gilbert (main author), Aaron Dowling, 1600. See geophysics section. Coulomb, C. A. (1785–89). Mémoires sur l'Électricité et le Magnétisme (In French; trans. Memoirs on Electricity and Magnetism), a series of seven memoirs. Contains descriptions empirical investigations into electricity. Established an empirical inverse-square law that would be named for him, by measuring the twist in a torsion balance. Cavendish would use a similar method to estimate the value of Newton's constant G. Introduced the Biot–Savart law, the magnetostatic analogue of Coulomb's law. Online links at Google eBooks (accessed 2010-09-26), and archived from the original at the Internet Archive. Introduced the famous eponymous law for electric current. Ohm, GS (1827). "Die galvanische Kette, mathematisch bearbeitet [tr., The Galvanic Circuit Investigated Mathematically]" (in German). TH Riemann, Berlin. Announced the now-famous circuital relation between voltage and current. Green, George (1828). "An Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism", Nottingham. Essay conceived several key ideas, among them a theorem similar to the modern Green's theorem, the idea of potential functions, and the concept of what are now called Green's functions. This (initially obscure) work directly influenced the work of James Clerk Maxwell and William Thomson, among others. Faraday's law of induction and research in electromagnetism. The third of James Clerk Maxwell's papers concerned with electromagnetism. The concept of displacement current was introduced, so that it became possible to derive equations of electromagnetic wave. It was the first paper in which Maxwell's equations appeared. Hall, E.H. (1879). "On a New Action of the Magnet on Electric Currents". American Journal of Mathematics vol 2, p. 287-292. Thesis (PhD), Johns Hopkins U. Details an experimental analysis of voltaic effect later named for author. The defining graduate-level introductory text. (First edition 1962) A standard undergraduate introductory text. General physics Lev Landau, Evgeny Lifshitz (1st Russ. ed. 1940, 1st Eng. ed 1960). Course of Theoretical Physics. Important ten-volume textbook in theoretical physics methods. Richard Feynman, Robert B. Leighton and Matthew Sands (1964). Feynman Lectures on Physics. Addison–Wesley. Bestselling three-volume textbook covering the span of physics. Reference for both (under)graduate student and professional researcher alike. Mathematical physics Edwin Bidwell Wilson, 1901. "Vector Analysis: A text-book for the use of students of mathematics and physics, founded upon the lectures of J. Willard Gibbs Ph.D.