Abstract
A simple, robust, telescopic instrument has been developed into an accurate tool for determining the closure movements in mine stopes. It consists of a central section graduated with a vernier scale, connected to a telescopic section that can be easily adjusted to provide a series of ‘steps’ or ‘ranges’ inside which small rock movements between permanently mounted studs can be measured. The instrument itself is taken away when not in use. The basic unit provides a continuous measuring range from 1.0 to 1.75 m, with a measuring sensitivity of 0.1 mm.
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