Objection to use of pipe brushing "ferret" to clean water mains would be removed if it were possible to detect "ferret " in main as it traveled; system is described whereby low frequency magnetic field radiated by device towed by "ferret ", may be used to detect location of ferret.
Transmission of signals from buried water mains
Brit Communications Electronics
British Communications and Electronics ; 9 , n 10
1962
3 pages
Aufsatz (Zeitschrift)
Englisch
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