| 31. | The US Navy secured a licence to copy the main shaft flexible coupling arrangement in US-built submarines.
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| 32. | The swashplate moves up and down, along the main shaft, to change the pitch of both blades.
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| 33. | Later this system was modified with the main shafts on the three upper floors being driven by belts.
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| 34. | The main shaft was re-timbered, a new headframe and brace constructed, and a 2, 000 gallon tank installed.
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| 35. | The air winch was repositioned and a winch house almost directly west of the main shaft was made.
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| 36. | Nobles Nob became an open-cut mine in 1967, after the main shaft collapsed on 11 August at 5am.
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| 37. | The mines have since filled with water; the main shaft extended in excess of 1100 feet straight down.
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| 38. | The remains of mullock dumps extend east from the early main shaft site and adjacent open cut workings.
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| 39. | The main shaft is rectangular, measuring high; by at the bottom . tapering to by at the top.
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| 40. | Used in this way, the other fingers are kept on the main shaft, with the thumb supporting the handle.
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