Mechanisms — arborist rigging

Recent Blogs

Spanish Barton (form 1) diagram
Spanish Barton (form 1) Mechanism Explained: 5:1 Compound Pulley Diagram, Parts and Uses

Posted by Robbie Dickson on

How the Spanish Barton form 1 tackle works, its 5:1 mechanical advantage, rigging formula, and worked example for lifting heavy loads in arborist and rescue...
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Timber Hitch diagram
Timber Hitch: Rope Arrangement and Illustrative Geometry

Posted by Robbie Dickson on

Explore the timber-hitch rope arrangement and illustrative wrap dimensions. The calculator does not predict grip, capacity or safe rigging.
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