Is B or H the fundamental magnetic field?

Circuit theory based on Kirchhoff´s laws is not powerful enough for the purposes of many engineers. They must understand, model and analyze electromagnetic phenomena at the level of Maxwell´s theory using quasistatic or fully dynamic formulations. This paper is concerned with the meaning of the field vectors E and D, which are associated with electricity, and B and H, which are associated with magnetism, in Maxwell´s equations. The arguments in support of the primacy of the B field are given first, at an introductory level, by drawing in particular on the thinking of Feynman (1964), Purcell (1985) and Raab (1992). Then, Chu´s (1960) model in which the H field is considered to be the fundamental magnetic field is outlined. Actually at issue is whether the classical electromagnetic field should be represented by the pairing E-B or E-H