Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.
|
See also:WHEEL (0. Eng. hweol, hweohl, &c., cognate with Icel. hjol, See also:Dan. hiul, the Indo-See also:European See also:root is seen in See also:Sanskrit chakra, Gr. r in Aos, circle, whence " See also:cycle ") , a circular See also:frame or solid disk revolving on an See also:axis, of which the See also:function is to transmit or to modify See also:motion . For the See also:mechanical attributes and See also:power of the See also:wheel and for the modification of the See also:lever, known as the " wheel and axis," and of the mechanical See also:powers, see See also:MECHANICS . The most See also:familiar type of the wheel is of course that used in every type of vehicle, but it•forms an essential See also:part of nearly every See also:kind of mechanism or machinery . Vehicular wheels in the earliest times were circular disks either cut out of solid pieces of See also:wood, or formed of See also:separate planks of wood fastened together and then cut into a circular shape . Such may be still seen in use among See also:primitive peoples to-See also:day, especially where the tracks, if any exist, are of the roughest description, and travelling is heavy . The See also:ordinary wheel consists of the See also:nave (0 . Eng. nafu, cf . Ger . Nabe, allied with "See also:navel"), the central portion or hub, through which the See also:axle passes, the spokes, the radial bars inserted in the nave and reaching to the peripheral rim, the See also:felloe or felly (0 . Eng. felge, Ger . Felge, properly that which fitted together, Teut. felhan, to See also:fit together) . From the monuments we see that the See also:ancient See also:Egyptian and See also:Assyrian chariots had usually six spokes; the See also:Greek and See also:Roman wheels from four to eight .
|
|
|
[back] SIR CHARLES WHEATSTONE (1802–1875) |
[next] BREAKING ON THE WHEEL |
There are no comments yet for this article.
Do not copy, download, transfer, or otherwise replicate the site content in whole or in part.
Links to articles and home page are encouraged.