i've seen them work in the past.. an always amazes me.. but was little leery..<br /><br />untill today..<br /><br />were puttin' in a new high voltage service to an old hospital.. an it's been underground pipe work since june..<br /><br />alotta diggin'..!!<br /><br />the backhoe opererator is the best i've seen ,,teamed with his laborer son.. <br /><br />it's been very dangerous cause where ever they dig ,, there's always something there.. gas line, water line, sewer, fiber optic, phone ,everythng..!!<br /><br />they hit pritnear everthin' in there path..<br /><br />today,, was the final dig.. an real close to the building were there's EVEN more stuff to hit.. <br /><br />but today,, we got a new backhoe operator.. <br /><br />before he dug,, he combs the ground with two pieces of bent copper wire.. he marked the suspect spots with those tiny flags.. <br /><br />an at each marking,, sure enuff,, there was something .. <br /><br />after the dig was over .. an before the backfill .. i combed the same place he did with the 'rods'.. <br /><br />i could see were the other stuff was.. an at EVERY spot,, the rods would literally turn parrarell to the obstruction.. <br /><br />i even tried my hardest to keep the rods from turning my hands ,, BUT COULDN'T.!!<br /><br />walk away,, an the rods turn back to pointing straight ahead.. get close to the next ,, an they turn parrarell to the obstruction again.. <br /><br />man ,, was it neet..!!<br /><br />WHAT THE HECKS THE SCIENCE OF THIS wizardtry,, anyway..!!