Email from Dr W. S. Eidelman (1-03): "Trombly's design is distinctly different from DePalma's. Trombly used the "closed-path" homopolar design, whereas DePalma used an "open-path" design. Trombly's worked, an DePalma's almost worked. Tewari received Trombly's clsoed path design in the mail, from DePalma, who happened onto an international patent application design, without Trombly's knowledge. Because Tewari's theoretical physics were in line with these technologies, and because, as head of nuclear power safety at the nuclear power station near Bombay, he had time, equipment, and  funds, he tried out the Trombly/Kahn design, and succeeded..."

More Info: http://www.rexresearch.com/tewari/tewari.htm