A. First Coupling Coefficient
The mutual inductance among the three self-inductances, involving the iron armature and its bobbin of a bifilar copper winding and a rotary aluminum disk plus its bronze spindle, is from a maximum of 100% down to the Golden Ratio of 61.8%.

B. Second Coupling Coefficient
The mutual inductance among the iron armature and its bifilar copper winding versus the aluminum disk is the square root of (100% – A).

C. Third Coupling Coefficient
The mutual inductance among bronze spindle and its aluminum disk is the cube of (100% – A).