  We show that the problem of unifying electromagnetism with gravity has an
elegant solution in classical physics through the phenomenon of induction. By
studying the way that induction leads to the formation of electromagnetic
fields, we identify the classical field equations which the unified field must
satisfy and a corresponding set of constitutive equations for the medium
sustaining the field. The unification problem is then reduced to the problem of
finding the exact form of these constitutive equations for different media by
experiments.
