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Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Reminds me of the old story used to explain the difference between near-field and far-field:
An EE lives near HV power lines, and builds a pickup coil to harvest energy from the massive field around them. Then he is somehow found out, and the power company sues him for stealing energy. His argument in court is "I was just collecting energy that would have been wasted anyway as it radiates away from the wires".
However, he is convicted because because the pickup coil takes energy from the capacitive near-field, which stores energy but does not radiate it. The energy he takes must then be replaced by the power line at the cost of the electrical company.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Here is my version done a few weeks before. 5 fluoros all earthed at their base back to the TC earth (which itself goes in a different direction). They are shown within 10 feet and then about 30ft. No magnetism (except electro magnetic fields) I have about 100 tubes to be creative with. I asked the hospital to keep them their throw-outs for me.
Registered Member #1316
Joined: Thu Feb 14 2008, 03:35AM
Location: Cambridge, MA
Posts: 365
My grandpa who worked on radios during WWII has stories of using a neon light bulb to see if the transmitters were running. He would just wave the bulb near a transmitter and it would light up. He also got shocked while working on them a few times , they were tube based and the main transmitter used 100k plus if I remember correctly.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Weston wrote ...
My grandpa who worked on radios during WWII has stories of using a neon light bulb to see if the transmitters were running. He would just wave the bulb near a transmitter and it would light up. He also got shocked while working on them a few times , they were tube based and the main transmitter used 100k plus if I remember correctly.
I get a nice shock from a flourescent tube in my Plasmasonic video on youtube. Pretty funny.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Has anyone ever tried this? I suspect the spot has to be just right where the line droop is lowest to the ground on a 500kV line with enough spacing between phases to avoid too much shading and no low earth line.
Last night I tried and could only get a neon to glow with about 10 feet of wire about 10 feet below a double 250V line which is below a 10kV feeder.
Later I will try with some bigger lines around. Most of our local 10kV lines have an earth return wire below. We have some bigger lines, possibly 100kV or more not far away so I will investigate. My electric field sniffer will pick up the field at ground level which is much more sensitive than the neon.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
I think there is always a flow of electrons against the ground in the vicinity of such a high voltage sources, mainly when the air contains a lot of humidity. So it has nothing to do with a magnetic field. I see something similar in case of my CW multiplier. Despite it is DC it can light up (little bit) a low pressure fluorescence bulb 1m far away.
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1,301 Florescent Bulbs Lit Solely by Magnetic Fields
, they were tube based and the main transmitter used 100k plus if I remember correctly.
