Autograph letter, signed. Bifolium, on Tesla's personal letterhead, dated July 15, 1899.
A letter to the Chicago newspaper publisher H. H. Kohlstaat, in which Tesla discusses the recent development of his laboratory in Colorado Springs, his writings on telepathy, his need for money, and the "highly gratifying" nature of his progress. "I feel now absolutely sure that by the time the Exposition comes I shall be able to furnish [an] apparatus which will carry a message to the European Continent and perhaps more than this." An early declaration of Tesla's goal to build the World Wireless System.