OK, let’s see what our smoke trap can do. Hold a sourceof smoke under the bottom of the “chimney.” A burningincense cone or twisted damp paper towel should work nicely.

When you see smoke coming from the top of the chimney, close the knife switch. Hey, it works! Now open the switch to see if the chimney starts smoking again. Yup, there it goes. Naturally, your model won’t be as efficient as industrial electrostatic precipitators. But its principle will certainly be the same.

A word about the coils: No matter whether you use the F-7996 coil or the Ford coil, it will have a vibrator on it. The vibrator should buzz smoothly when the knife switch is closed. If it doesn’t, open the switch and adjust the nut on the vibrator arm.