The lower revolving MILLSTONE of a horizontal pair.
Millstones driven from below; the customary arrangement in a watermill.
The lower compartment of a Norse mill, containing the TIRL.
A form of WATERWHEEL, driven by the IMPULSE of water passing beneath and striking the lowest FLOATS. Of use where the fall of water is insufficient to turn an OVERSHOT or BREAST WHEEL. Explore other types of waterwheel in our Thematic Glossary.
See Straight Dress.
Universal (Centre) Iron
A coupling between the ends of two SHAFTS which allows for the shafts to be aligned in different directions. A "Hook Coupling". Comprising yokes and cross-type trunnions
Waterwheel buckets in which no air-escapes are provided to assist with rapid filling. The lower edges of the buckets fit closely to the SOLE plate. See also VENTILATED BUCKET & BUCKET.
(1) The intermediate longitudinal battens of a SAIL FRAME(1). (2) see SHUTTER BAR.
Upper Side Girts
Side beams supporting the tailbeam under the wind-shaft in a post mill.
See Runner Stone.
The main vertical driving shaft of a wind or water mill upon which the WALLOWER, the GREAT SPUR WHEEL and the CROWN WHEEL are mounted. Also called a MAIN SHAFT.