Locator for metallic pipe with AC signals impressed

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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324 67, G01V 308

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active

039886638

ABSTRACT:
A locator for buried metallic pipes which carry AC signals impressed as a result of various industrial activities. It employs a pick-up coil with a ferromagnetic core. The coil is connected to a tuned bandpass amplifier that has its output connected to a head set and a meter for detecting the amplitude of the signals developed.

REFERENCES:
patent: 2109189 (1938-02-01), Bly
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patent: 2651021 (1953-09-01), Hays
patent: 2698921 (1955-01-01), Wharton
patent: 2744232 (1956-05-01), Shawhan et al.
patent: 2908863 (1959-10-01), Neff
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patent: 3066256 (1962-11-01), Rasor
patent: 3418572 (1968-12-01), Humphreys
patent: 3866111 (1975-02-01), Warren
patent: 3893025 (1975-07-01), Humphreys
patent: 3894283 (1975-07-01), Schonstedt
Young, C. A., Measuring the Depth of Buried Cable, Bell Laboratories Record, Nov. 1965, pp. 399-401.

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