You may find additional reasearch in the papers of L.L. Nunn which, I believe, are with the Teluride Foundation at Cornell University, Ithica, New York. Nunn was a mineing engineer who knew of Tesla's work and with Westinghouse proved the value of AC current in the mines of Teluride, Colorado. Nunn founded a small, isolated but excellent college in the high desert of California, Deep Springs College, one of the most unique schools in the U.S.. Deep Springs may also have additional information on Tesla. Although I am certain that Deep Springs is on the internet somewhere, I do not have an address. P. Lee Director, Los Angeles Maritime Museum