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Eyeball in Grand Canyon

By Pacific Coastal and Marine Science Center 2004 (approx.)
A pontoon boat floats on a river through a red-rock canyon and a man guides an instrument suspended from a cable into the water.
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Detailed Description

USGS scientist guides an instrument called the "eyeball" into the Colorado River in Grand Canyon.

Sources/Usage

Public Domain.

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Line drawing showing the components of an instrument featuring a ball on one end of a long cabling system.

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