Bleeper

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A surveying instrument that is a type of proton gradiometer, working on the same principle as the magnetometer. When two detector bottles are used, one near ground level and one about 2 m above, small magnetic anomalies underground affect the lower, nearer, bottle more strongly than the upper. The signals from the two get out of step, and their sound signal is broken into a series of 'bleeps'. It is unaffected by large scale disturbance, an advantage over the magnetometer, and is much simpler, cheaper, and more portable than either magnetometer or gradiometer.

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A type of proton gradiometer, in which the reading is given as a series of bleeps. This design of magnetometer is very cheap to produce, and has therefore been widely used in archaeology.

The Macmillan dictionary of archaeology, Ruth D. Whitehouse, 1983Copied

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