Calculation of the Mutual Inductance of Co-Axial Cylindrical Coils of Small Radial Depth

This note shows how the mutual inductance of coaxial cylindrical coils of small radial depth may readily be obtained by the use of curves of a type recently described by the United States Bureau of Standards. These curves cover the mutual inductance between coaxial circles, and by a very simple process of summation their usefulness can be extended to coils of small radial depth.