There have been many times when I’ve had to locate underground lines for water, sewer, gas or electricity. After digging too many exploratory holes, my brother showed me an easy way to locate pipes or conduits made of ferrous metals. I was skeptical, but 1 became a convert.
First, cut yourself two pieces of 1/2-in. copper pipe about 6 in. long (see drawing). Then take two metal coat hangers and cut them into 18-in. lengths. Straighten the hangers out, and make a 90° bend in each one 6 in. from the ends. You now have what look like two big Ls. Insert the short end of each L into one of the copper pipes.
To use the rigs, hold a pipe in each hand in front of you, about a shoulder-width apart. The hangers should move freely in their pipes. I suggest you start with a known underground line so that you can see what to look for. Holding the pipes with the wires pointing forward, slowly walk toward the line. As you approach it, the wires will swing inward. When they cross each other, you’re directly over the line. The closer you are to the ground, the greater the accuracy.
Dennis T. Harbison, West Chester, PA
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I was searching for any articles on running gas lines and came across this "old gem". Didn't really find any relevant articles but the amusement that this tip brought me more than made up for it.