Acid-dip survey

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A method of determining the angular inclination of a borehole in which a glass, test-tubelike bottle partly filled with a dilute solution of hydrofluoric acid is inserted in a watertight metal case. When the assemblage is lowered into a borehole and left for 20 to 30 min, the acid etches the bottle at a level plane from which the inclination of the borehole can be measured. CF: Kiruna method acid test; acid-etch tube. Long
Source: Dictionary of Mining, Mineral, and Related Terms

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