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A jewel block is a block on sailing ships through which the halliard is rove.
It is a single 7-inch block that is suspended from an eyebolt at the yardarm. It is the preferred term for the "studdingsail halliard block".
References
- Biddlecombe, G. (1990). The Art of Rigging. Courier Dover Publications. 107.
- Longridge, C.N. & Bowness, E. (1981). The Anatomy of Nelson's Ships. Naval Institute Press. 250.
- Harland, J.H. & Myers, M. (1984). Seamanship in the Age of Sail: An Account of the Shiphandling of the Sailing Man-of-War, 1600-1860, based on contemporary sources Naval Institute Press. 163.