Abstract
The authors describe an altered version of the borehole extensometer developed by the Building Research Station for observing ground displacements in foundation engineering. The original extensometer used a circular magnet as a marker and a reed switch as sensor. The same components are also used in the system described in this technical note, the distinction from the original one being related to the signal transmission when the reed switch is closed by the magnet. The new sensor system uses an oscillator as signal source and this simplifies the reading method, since electrical cables can be avoided. (TRRL)
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