Topic Pulleys, etc.  with an eye for their use in AWES operations https://en.wikipedia.org/wiki/Pulley https://en.wikipedia.org/wiki/Block_and_tackle http://specopsblog.blogspot.com/2014/01/theoretical-vs-practical-mechanical.html https://en.wikipedia.org/wiki/Breeches_buoy https://www.harken.se/pbpage.aspx?pageid=9047 https://www.harken.se/productcategory.aspx?taxid=5209 Stage Rigging Handbook   https://www.amazon.com/Stage-Rigging-Handbook-Third-Glerum/dp/0809327414

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Why Snatch Blocks are AWESOME (How Pulleys Work) - Smarter Every Day 228