Posted by Richard from SE AZ on November 11, 2018 at 22:37:29 from (209.203.84.174):
In Reply to: Landing Mats posted by jim in N.M. on November 11, 2018 at 14:25:48:
As an underground miner we used many thousands of those landing mats to support ground in underground mines. Holes were drilled into the ground and long bolts with an expansion shell on the threaded end and a steel plate on the other end were put through one of the holes on the mat and pushed up against the ground. Then the bolt was tightened pulling the mat tight against the ground. Other holes were drilled through some of the other holes in the mat and more bolts added. The expansion shell worked on the same principle as the lead or plastic inserts used to hold a screw in concrete or drywall. Mats are still used in underground mines but they are made of thinner sheet metal but are still called mats.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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