I’m an Industrial Engineer and the speciality I chose during my University studies was Electrical machines, such as transformers, generators, electric motors…
Unfortunately my 30+ years long professional activity diverted very much away from that domain and there’s little I know or remember about that now.
There are several different ways of coiling the windings around a ferromagnetic core and reading text descriptions of how it should be done doesn’t help me much to actually understand and visualize how a certain type of interlaced winding must be.
I’ve found this on the web and the cross-over winding is explained. However, the written explanation without an image doesn’t help me much.
Good luck and 73,
Guru