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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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