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The pie tin was then suspended 2.7 meters in the air by a fishing pole. The pie tin was insulated from ground by the nylon fishing line. A wire connection was hung from the pie tin to the top terminal of a gold leaf electroscope. The outer case of the electroscope was connected to Earth ground. https://drive.google.com/file/d/1uqsbaS0AHODgpoTde8otFWUjjQ21BesG/view?usp=sharing
These field values seen low and this might be due to my backyard being in a depression with the terrain sloping up on two sides. I might try doing this experiment in my front yard were the terrain slopes down on two sides. If the neighbors see this however they'll probably think I'm a nut job.
Registered Member #46264
Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
The pie tin is being used as a voltage probe for the fair weather electric field. The ionization caused by the Am-241 speeds up the probe reaching the same potential as the air around it. The fair weather electric field is generally positive pointing down towards the Earth. Conductive objects at ground potential exposed to this field actually have a net negative charge on their surface to counteract this field. The pie tin is initially at ground potential and so has a net negative charge. Positive air ions are attracted toward the pie tin and start to neutralize its negative charge. This process continues until the pie tin reaches the same local potential as the air around it at which point no net charge is being exchanged.
Air movement can effect the local potential for example if the air contains charged dust or water droplets.
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Fishing for atmospheric electricity
