When was the First Transformer been Constructed and called “Transformer”?

Would you wonder who gave the name “transformer” to a transformer?

The first practical transformer was built in 1885 and designed by Max Deri, Otto Bathy, and Karl Zipernowsky. It’s a core type and approximately 1,400 VA (1.4KVA). The three Engineers had the “privilege” of using the term “Transformer” for the first time.

The very first transformer (this was impractical to use as noted by the three Engineers) which was used to step-up and down voltages in an AC distribution system was called “secondary generators”. It was patented by a Frenchman Lucien Gaulard and an Englishman, John D. Gibbs.