This ad appeared a hundred years ago this month in the October 1919 issue of Electrical Experimenter. It touts the seemingly miraculous health benefits of the Rogers Ozone Generator, which was said to provide relief from lung and bronchial troubles, particularly hay fever, catarrh, and colds.  In addition, it gave the user a figurative trip to the mountains, since it produced a heavy flow of ozone  combined with vaporized pine needle oil.  It relied upon a separate violet ray high frequency generator, fully guaranteed as to material and workmanship.