A tackle extending from the end of the boom to the top of the mast in a derrick. The trussing placed below or at the sides of the boom to strengthen it. (Bridge, 2019)
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A tackle extending from the end of the boom to the top of the mast in a derrick. The trussing placed below or at the sides of the boom to strengthen it. (Bridge, 2019)
« Back to Glossary Index