While playing with that, he realized that an inexpensive glass or plastic lens could ... good enough to try a few casting shots with epoxy resin. [Zach] ran into a few problems along the way ...

The material of the core of a resin cast dry‐type transformer is high‐quality cold‐rolled grain‐oriented silicon steel sheet, of a 45 ∘ fully inclined joint structure. Windings made of the glass fiber ...