Mining Journal

Mining Journal

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(A similar manually- operated tool was also developed.) The strain cell to be installed at the end of the borehole is plugged into the four - pin plug in the installing tool. ... Electrical leads from this plug join the instrument to a switch box and a battery-operated strain indicator. ... side walls, and the length of the vents assists in relieving any pressure created by gas given off at the end of the charging period.

Title:Mining Journal
Publisher: - 1965


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