A Semi-automatic Displacement Recorder


Türker Mirata

Professor, Civil Engineering Department
Middle East Technical University, Ankara, Turkey


A semi-automatic displacement recorder (sadir), a simple device for recording displacements up to 50 mm, by making pencil marks on a probe, is described.  The distance between such marks has afterwards to be measured using a mm scale; this limits the accuracy of such measurements to about 0.2 mm.  The device has been made by simple tools, using improvised materials, and is presented as an example of  possible alternative designs.  Three of such devices have been made, calibrated against a dial gauge, and  used successfully in a prismatic wedge shear test.  An improved, modified version is also described.

KEYWORDS: displacements, laboratory equipment, recorder, semi-automatic, shear test,  wedge shear test.


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