Transverse Flux Machine
Laithwaite first built a system using two rows of &quot;C&quot; cores and then found that a single row would do the job as shown in the following photo.

E.R. Laithwaite &quot;Linear Propulsion by 'Electromagnetic River'&quot;, in Production Engineer Vol 53, no. 7.8, pp 219-223, Jul/Aug 1974