Typical industrial Epstein frame loaded with a sample of electrical steel. The corners are loaded with 10 N weights.
Photo courtesy of Wolfson Centre for Magnetics, Cardiff University.
epstein_frame_magnetica.jpg
You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial, and with any modifications (the permission is hereby given, so there is no need to ask for it explicitly again), but you MUST always give the following credits:
S. Zurek, Encyclopedia Magnetica, CC-BY-4.0
We would appreciate if you let us know of any use: info@e-magnetica.pl