15 — Mining Engineering
Rotary Tell-Tale
A tell-tale with a rotary dial indicator that amplifies small roof displacements for easier reading from the roadway floor. Used in strata control practicals to illustrate sensitive measurement of roof dilation.
01 — Same Category
More in Mining Engineering
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23
Model of Fore Poling
A model demonstrating the fore-poling method of advancing support, in which poles or sheets are driven ahead of the face to hold weak ground while excavation proceeds. Used in instruction on tunnelling and drivage through loose strata.
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24
Working Model of Ventilation District of Underground Coal and Metal Mine
A working model of a complete ventilation district showing intake and return airways, districts, and control devices for both coal and metal mine layouts. Enables students to trace air circuits and understand district ventilation design.
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25
Model of Wedge Cut
A model illustrating the wedge cut pattern of blast holes used to create a free face in tunnel and drivage blasting. Supports instruction in drilling and blasting design and burn/cut geometry.
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26
Model of Underground Mine Support
A model displaying common underground support systems such as props, bars, chocks, and roof bolts as applied at roadways and faces. Used to teach strata control practice and support selection.
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27
Single Height Tell-Tale
A borehole-mounted roof movement indicator with a single anchor horizon that gives a visual reading of roof sag above a roadway. Used to teach routine strata monitoring and trigger-level based support management.
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28
Dual Height Tell-Tale
A roof movement indicator with two anchor horizons that distinguishes movement within the bolted height from movement above it. Demonstrates diagnostic strata monitoring in roof-bolted roadways.
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30
Auto Warning Tell-Tale
A tell-tale fitted with an automatic visual or audible alarm that triggers when roof movement exceeds a preset limit. Teaches action-level based monitoring and early warning practice in underground roadways.
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31
Pitot-Static Tube
A probe that senses total and static pressure to determine air velocity and velocity pressure in ducts and airways. Used with a manometer in ventilation laboratories for velocity traverses and fan duct measurements.
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32
Sylvester Prop Withdrawer
A hand-operated ratchet and chain device for withdrawing supports and props from goaf edges at a safe distance. Demonstrates safe prop withdrawal procedure required in caving and depillaring operations.
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33
Extensometer
An instrument that measures relative displacement between anchors in a borehole or across a specimen, used to monitor strata deformation or rock strain. Supports laboratory rock testing and field strata-monitoring exercises.
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34
Telescopic Convergence Indicator
A telescopic rod instrument for measuring roof-to-floor convergence in underground roadways and at longwall faces. Used to quantify closure rates and assess strata behaviour in strata control practicals.
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35
Core Cutting and Grinding Machine
A machine for cutting drilled rock cores to length and grinding their ends flat and parallel to specimen standards. Prepares cores for uniaxial and triaxial compression testing in the rock mechanics laboratory.
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