Self-orienting passive marker structure

Details Self-orienting passive marker structure Self-orienting passive marker structure

1986-05-29

1987-12-08

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

324329, G08B 1318

Patent

active

047120940

ABSTRACT:
A passive marker including a tuned circuit having an inductance and a capacitance carried by a carrier enclosed within a hollow sphere that is partially filled with a liquid to freely float the carrier. The inductance includes a coil which, when the carrier is floating, positions the axis of the coil so it is closer to the vertical than the horizontal. The passive marker is of a type that is buried relative to portions of utilities such as gas, telephone, water and power lines, for use in locating such portions when necessary.

REFERENCES:
patent: 3836842 (1974-09-01), Zimmermann et al.
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4292590 (1981-09-01), Wilson

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