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Jewel block
A jewel block is a block on sailing ships through which the halliard is rove.〔Biddlecombe, G. (1990). ''The Art of Rigging''. Courier Dover Publications. 107.〕 It is a single 7-inch block that is suspended from an eyebolt at the yardarm.〔Longridge, C.N. & Bowness, E. (1981). ''The Anatomy of Nelson's Ships''. Naval Institute Press. 250.〕 It is the preferred term for the "studdingsail halliard block".〔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.〕 ==References==
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