Woooo-EEEE-ooooo!
There was an article about it in, I believe, the old Mechanix Illustrated.
It works on the same principle as those ionic fans you see advertised.
I remember that de Seversky was using 30,000 volts at 30 mils (90 watts) as a power source.
He had a metal wire and balsa frame about 18 inches square that looked like a small bed springs. Arranged on top of the frame were a number of these little arrowhead looking wires. The arrowheads were negatively charged and the frame was positively charged. As the charges moved from negative to positive, they dragged air molecules along with them.
It is mentioned in the following text found at the following link:
Besides his role as a military prophet, de Seversky continued his activity as a technological inventor and innovator. In line with the emphasis on pollution, he invented a wet-type electrostatic precipitator for attaching air pollution. This added to the list of new developments he previously pioneered, which included the cantilever-skin stressed aircraft wing structure, flight refueling, trailing-edge wing-flaps, and the "Ionocraft", a heavier-than-air levitation device depending on ionic emission, which was built and demonstrated.