| 1. | This sheave was attached to the input shaft of the transmission.
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| 2. | This was simply a variable width sheave controlled by spring and hydraulic pressures.
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| 3. | The power block is a large powered aluminium pulley with a hard rubber-coated sheave.
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| 4. | During shutdown, the actuator is used to lower the upper sheave to loosen the drive belts.
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| 5. | It is a " wood four-post type headframe with one sheave instead of two ."
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| 6. | Unlike other topmasts, the sprit topmast, because of its odd angle, lacked a sheave.
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| 7. | Safety concerns also led to replacement of the old pulley-sheave with a new gin-wheel.
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| 8. | Two sheave wheels, 1120mm diameter with a 120mm diameter and a 120mm deep rim lie on a nearby rubble heap.
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| 9. | The diameter of a loft block sheave for galvanized aircraft cable is typically at least 32 times the diameter of the cable.
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| 10. | The wire rope had parted approximately where it rested over the topmost sheave, when the davit was in its stowed position.
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