A-Z glossary

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Worm

(1) Cylindrical GEARWHEEL bearing a helical TOOTH or START; frequently used in conjunction with a rack in windmill winding gear. It could be regarded as a single-toothed GEAR WHEEL. Sometimes provided with more than one tooth or 'start'. In Westmorland it was used as part of the MILLSTONE lifting hoists. (2) see AUGER.