a ball bearing is a type of rolling-element bearing which uses balls to maintain the separation between…
A pair of hands smoothing a clay container formed by curling large sections of rolled clay together.
"In geometry, a curve generated by the motion of a point on the circumference of a circle which rolls…
An illustration of a group of men rolling barrels of flour down a steep enbankment
A roller. Crushes clods and packs the surface so as to keep the seed moist at the expense of increased…
Spiral with lines AB and CD drawn on piece of paper and rolled into a cylinder to form spiral running…
A cylinder of wood, plastic, cardboard, or other material on which wire, thread, or string is wound.