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Through the many millennia of the Paleolithic period and the Neolithic period no use of the wheel was known to humans. Its use was not known to the Native Americans until the Europeans introduced it. In the Old World it came into use in the Bronze Age, when oxen and horses were first used as draft animals and wheeled vehicles were devised. Wheels for vehicles were at first solid wooden disks; spoked wheels were introduced c.2700 B.C. The potter's wheel was invented in the Bronze Age, earlier pottery being made, like that of the Native Americans, without the use of the wheel. See geargear,
toothed wheel, cylinder, or cone that transmits motion from one part of a machine to another; it is one of the oldest means of transmitting motion. When the teeth of two gears are meshed, turning one gear will cause the other to rotate.
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; tiretire,
device made of rubber and fabric and attached to the outer rim of a vehicle wheel. Solid rubber tires were in limited use before 1850; they are still used in some special applications, e.g., for industrial trucks in factories.
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; wheel and axlewheel and axle,
simple machine consisting of a wheel mounted rigidly upon an axle or drum of smaller diameter, the wheel and the axle having the same axis. It is fundamentally a form of lever, the center common to both the wheel and the axle corresponding to the fulcrum, the
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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.


(design engineering)
A circular frame with a hub at the center for attachment to an axle, about which it may revolve and bear a load.


1. a solid disc, or a circular rim joined to a hub by radial or tangential spokes, that is mounted on a shaft about which it can turn, as in vehicles and machines
2. a device consisting of or resembling a wheel or having a wheel as its principal component
3. short for potter's wheel
4. a type of firework coiled to make it rotate when let off
5. a set of short rhyming lines, usually four or five in number, forming the concluding part of a stanza
6. the disc in which the ball is spun in roulette
7. US and Canadian an informal word for bicycle
8. Archaic a refrain


[slang "big wheel" for a powerful person] A person who has an active wheel bit. "We need to find a wheel to unwedge the hung tape drives." (See wedged).
References in periodicals archive ?
Wheel Pros is backed by private investment firm Clearlake Capital Group, L.P.
Accuride's acquisition of Mefro Wheels will create a global commercial vehicle wheel and wheel-end component supplier employing approximately 5,000 people at 15 manufacturing facilities in North America, Europe, Russia and the Asia-Pacific region.
Wheel wear phenomenon can be divided into uniform wear and non uniform wear, uniform wear mainly refers to the wheel tread wear along the wheel circumference direction are almost the same, which is mainly due to the abrasive wear, adhesive wear and plastic deformation; Non uniform wear includes certain non random wear due to wheel material defects and impact load factors, such as the wheel out of round, polygonal wheel et al.
For curved measurements, a best-fit approach was taken in the Google Earth Pro software to match the beginning, arc of the curve, and endpoint of the curved measurement to the measurement that was obtained using the measuring wheel. Figures 6, 7, 8, 9 represent the overall, beginning, end, and documentation photographs for a curved measurement taken at the Floral Clock in Ontario, Canada.
In the presented work, the task of the estimation of influence of new technological solutions on internal metal stress of the supporting wheel of block wheel pair in the area of its contact with surface of rail.
Now, GeoOrbital has launched a campaign with global funding group Kickstarter to accept pre-orders and market the detachable wheel before it commercially debuts in stores.
Vitrified bonds enable the manufacturer to control the strength, chip clearance and wheel loading by modifying the porosity and structure of the wheel.
That's what they're trying to combat with larger wheels and shorter sidewalls.
Then lightly scuff all the painted areas around the entire wheel, including areas near the tire bead and lug nuts.
Where wheel stops are used, the intention is that they will be covered by a vehicle that properly pulls into the parking space.
where: [[omega].sub.a1], [[omega].sub.a2l], [[omega].sub.an] are angular velocities, respectively, of the first, second, and the n-th axle; [r.sub.a1], [r.sub.a2i], [r.sub.an] are wheel radiuses, respectively, of the first, second, and the n-th axis.