December 19th, 1891 letter from Prof. Michael Pupin to Nikola Tesla - Page 3

would take any adverse discussion of my inventions. If there is anything in this world that I sincerely believe it is nothing on thing and that is that the credit of showing the practical importance of alternating currents (the bi- and polyphase) for work belongs entirely to you. The belief I expressed in the very first part of my paper. The reason that I ascribe the German motor is simply due to the fact that it is the only alternating current motor of a large size that I have ever seen.

At Ferraris’ blundering has been indulged in by your competitors to a disgraceful extent. As I understand