Induction arrows for a buried conducting plate

A scaled electromagnetic analogue model is used to study the behaviour of single station induction arrows over a conducting plate embedded in a homogeneous poorly conducting medium. For a profile crossing the edge of the conducting plate, the in-phase arrow, for all locations, points towards the bulk of the good conductor while the quadrature arrow reverses direction directly over the edge, consistently pointing towards the edge. The results also show that both the in-phase and quadrature arrow lengths are reduced with increasing conductor thickness and depth of burial. The model results are applied to examples of a uniform depth ocean and a conducting sill embedded in a poorly conducting Earth.