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Many types of blocks are required to multiply hand leverage on lines, halyards and sheets (collectively referred to as .running rigging," as compared to the fixed "standing rigging" such as masts, booms and spars). Large sails, in particular, can only be trimmed and controlled with the mechanical advantage supplied by properly rigged blocks. Here, we have: a single becket block with wood shell; a bronze "clamshell" block; and the versatile "snatch" block, and extremely useful block that can be used without having to rove an idle line through the sheave beforehand.