Most of the info is from notes and correspondence. That is why I said it brought back memories.
The DC in St. Louis was supplied by Union Electric (POCO) to several older buildings for elevators.
The 2 phase was in a school in Manhattan. I recall that the neutral was much larger than the phase lines and that was due to the neutral carrying the sum of the phase lines, not the unbalance. Trying to adapt 3 phase equipment was tough.
The 6 phase double delta was for the Cline-Westinghouse rotary press drive system. In order to get 550 DC there were phase shift xformers, large banks of silicon rectifiers, and 6 ignitron tube rectifiers (water cooled no less) for each of 2 systems, and misc other parts. Amplidyne sets were utilized for control integration. Each of the rotary newspaper presses had a 50HP motor and I seem to recall that 75,000 papers per hour could be produced by each system. I was called in due to arc-overs on the ignitrons. It turned out that the water cooling the ignitrons was flowing too fast and was too cold. Sometimes trouble shooting has interesting results.
Rowdy
