"K1TTT" wrote
...

no whirls... the mathematical operator is called curl, but it does not
relate to the often pictured whirl or vortex.

The math is for the geometrcal description.

In Maxwell hypothesis are the molecullar vortices. The line of force rotate.
Around the wire are the rings like the Helmholtz smoke rings. The line of
force can rotate continously or oscillate. Nothing flow along the line of
force. Maxwell did this model for the transverse waves. They are in solids
and the math is used for the torsional vibrations.

Next Heaviside did more simple math for the TEM. It is tought as EM. But I
dont understand it.
S*