Blocks under the tops

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Jul 10, 2021
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Vancouver Island
Under the main and fore tops there are rows of double blocks. I know that most of them are for buntlines. Some on the foretop are used for spritsail braces. What are the extra blocks on the maintop used for?
 
Thanks for the response. Petersson doesn't show the martinets. He has martingales. Same thing?? He shows brails but not going to the top.
 
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