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| Adit or level | This is a horizontal tunnel driven for access to the mineral vein but also serves for drainage from the workings above. |
| Angle Bob | A device for changing the direction of motion of pump rods from the horizontal to the verticaal plane. |
| Force pump | |
| Lady Isabella | Reputed to be the largest water wheel in the world. Located at Laxey, on the isle of man. L.I. was used for pum,ping from the Laxey Mine. |
| Launder | A wooden trough or channel used for directing water to (or away from) a particular point. often found directing water onto a wheel. |
| Settling ponds (also slime ponds) | Long rectangular shallow ponds used to allow the fine particles from crushing and water separation, to seyle out. |
| Vein | A narrow fracture in rock into which minerals have been deposited |
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