jar

jar

a. An appliance to permit relative movement between the rope and rods in a cable drill. It reduces shocks and the risk of rod or chisel breakages. See also: free-falling deviceb. To loosen or free stuck drill-stem equipment or tools by impacts delivered by quick, sharp, upward-traveling blows delivered by a drive hammer or jars. Long
Source: Dictionary of Mining, Mineral, and Related Terms

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