A sub-scale simulation of a high-voltage transmission line was constructed and operated in a chamber roughly 1.5 meters long by 0.5 meter in diameter to determine ozone production characteristics. Effects of voltage and corona power, conductor size and surface condition, air temperature, relative humidity, and air flow rate (wind velocity) on ozone yield were determined. Of these, corona power (voltage), relative humidity, and air flow rate exhibited significant effects on ozone yield. Averaged yield values ranged from about 3 gm/kw-hr at high humidity (75-80 percent) to about 7 gm/kw-hr at low humidity (25-30 percent). (Author)