Show Crop's got it right. That's a seismic crew. They either set off explosives to make a shockwave, or these vibratory trucks, and they have long strings of microphones that look like orange extension cords strung along the ground. It's like echo sounding when ships are looking for submarines, but now they're looking to see what rock formations are underground. Very common in the oil and gas industry, although it is also done by universities or government just to do research on local geology. If it's industry, probably oil, maybe mining, depending on your location.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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