As Part of a Research Programme Into Ground Movements, a Simple and Accurate Method of Measuring Relative Displacements Along a T Orehole Has Been Developed by the Duilding Research Station Using Circular Magnets and Reed Switches. Details Are Given of the Axially Magnetized Magnet and Reed Switch Used, Method of Inserting the Magnet Into the Borehole, Sensing Systems, Accuracy of Measurements, and Fields of Application.
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Burland et al. (1972) studied this question.