A 1920s Ozone Generator—“Sea Air in the Home”

Just £9-9-0 in 1925, or around £450 today. Its interrupter high-voltage generator works on either AC mains (“electric light”) current or DC “wireless accumulator” (radio battery bank) power, and a switch selects 100 or 200 volt supply. The interrupter makes a loud buzzing sound whenever it is running—think of it as “the sound of the sea”.