Skogsgurra
Electrical
This time of the year (when calves are born with double heads and nature in general behaves in an unpredictable manner - we call it "rotmonth" because food can't take the heat and humidity very well). This time of the year, as said, we also hear new and old urban myths. One of them is the electric lake.
This happened: One guy was swimming across a little lake when he felt a tickling in his fingers. It was in a confined area and he could swim out of and into that area. He told other people about it and now it seems that most everyone can feel it - no matter where in the lake they happen to wet their feet. So, I think that most of this is due to a "me too" effect. But the first guy seems to be sure about what he felt.
There are three major pipes terminating in the lake. Two are for snow guns (not in operation during summer) and one is the outlet from a sewer station (yes, very clean). The pipes are said to be stainless steel in the ground and some plastic material in the water.
Questions:
A Anyone had this before?
B What standard measurement techniques are there?
I plan to do a "potential map" using a DMM and a surface electrode shaped as a with cylinder about 1/4 sqm external surface (an ordinary bucket - that is). I will use an iron bar that I just let drop down to the bottom and sink into the mud as a counter-electrode. I will take readings with a high-impedance DMM (it has Gohms on one range) to see if there is anything at all. After checking that, I will switch to a relevant range (all other ranges have 10 Mohms) and then take down the readings across the "offending" part of the lake. I will use a GPS to get my coordinates.
I may also bring some fishing gear.
Comments invited. Especially if you have done anything like this before.
Read all about it on Sorry only in Swedish. But there is a picture showing a couple of guys trying to "ground" the lake. ;-)
Gunnar Englund
This happened: One guy was swimming across a little lake when he felt a tickling in his fingers. It was in a confined area and he could swim out of and into that area. He told other people about it and now it seems that most everyone can feel it - no matter where in the lake they happen to wet their feet. So, I think that most of this is due to a "me too" effect. But the first guy seems to be sure about what he felt.
There are three major pipes terminating in the lake. Two are for snow guns (not in operation during summer) and one is the outlet from a sewer station (yes, very clean). The pipes are said to be stainless steel in the ground and some plastic material in the water.
Questions:
A Anyone had this before?
B What standard measurement techniques are there?
I plan to do a "potential map" using a DMM and a surface electrode shaped as a with cylinder about 1/4 sqm external surface (an ordinary bucket - that is). I will use an iron bar that I just let drop down to the bottom and sink into the mud as a counter-electrode. I will take readings with a high-impedance DMM (it has Gohms on one range) to see if there is anything at all. After checking that, I will switch to a relevant range (all other ranges have 10 Mohms) and then take down the readings across the "offending" part of the lake. I will use a GPS to get my coordinates.
I may also bring some fishing gear.
Comments invited. Especially if you have done anything like this before.
Read all about it on Sorry only in Swedish. But there is a picture showing a couple of guys trying to "ground" the lake. ;-)
Gunnar Englund
