wheel(redirected from carborundum wheel)
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See R. J. Forbes, Studies in Ancient Technology (1955); E. Tunis, Wheels (1955); W. Owen et al., ed., Wheels (1972).
a part found in machines and mechanisms; it takes the form of a round plate or of a rim joined by spokes to a hub. A wheel can spin freely on an axle or be fastened to it, and it is used to transmit or convert rotary motion.
The wheel, one of the greatest inventions of mankind, has been known since about the middle of the fourth millenium B.C. (in Mesopotamia). The wheel was an improvement on the wooden rollers that had been used for millennia to move loads. Initially the wheel was a round plate fitted to an axle. In the second millennium B.C., its design was improved: the wheel with spokes, a hub, and a circular rim appeared. Later a metal rim came into use for increased strength and durability, and much later the rim was replaced by the tires used in motor vehicles.
The invention of the wheel furthered the development and improvement of crafts and trades: the potter’s wheel, the grinding wheel in mills, the spinning wheel, and the lathe are all derived from the wheel. With the invention of self-propelled vehicles, the wheel began to act as a link in the propulsion system. Water wheels have been used in irrigation works, manufacturing mills, mines, and elsewhere. In the 19th century the the water wheel as an energy converter was gradually replaced by the turbine, which is also basically a wheel. In a majority of operating machines, the wheel alters the rotation speed, changes the direction of motion, or transfers motion from a horizontal axis to a vertical one or vice versa (in belt and gear drives and the like).
What does it mean when you dream about a wheel?
A wheel may indicate completion of a project or the continuation of a familiar situation. A circle is also a spiritual sign of that which has no beginning and no end. Alternatively, the dreamer may be caught in a situation in which he or she feels they are going in a circle.