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Ingegneria meccanica: Industria petrolifera
| English |
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| Noun |
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| Countable |
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| rotary jar |
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| A tubular run on a drill string or fishing string that is designed to impart a sharp upward or downward blow to the string on command. |
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| Sh91 |
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| The accelerator jar is used to give the hydraulic jar more hitting power and also to keep jarring effect from damaging the drill string. |
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| Hdp86 |
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| Petroleum Engineering |
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| drill stem |
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| jar |
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| 3 |
