Sledge

A sled, skid, sledge, or sleigh is a land vehicle that slides across a surface, usually of ice or snow. It is built with either a smooth underside or a separate body supported by two or more smooth, relatively narrow, longitudinal runners similar in principle to skis. This reduces the amount of friction, which helps to carry heavy loads.

Some designs are used to transport passengers or cargo across relatively level ground. Others are designed to go downhill for recreation, particularly by children, or competition. (Compare cross-country skiing with its downhill cousin.) Shades of meaning differentiating the three terms often reflect regional variations depending on historical uses and prevailing climate.

In British English, ''sledge'' is the general term, and more common than ''sled''. ''Toboggan'' is sometimes used synonymously with ''sledge'' but more often to refer to a particular type of sledge without runners. ''Sleigh'' refers to a moderate to large-sized, usually open-topped vehicle to carry passengers or goods, and typically drawn by horses, dogs, or reindeer.

In American usage ''sled'' remains the general term but often implies a smaller device, often for recreational use. ''Sledge'' implies a heavier sled used for moving freight or massive objects. ''Sleigh'' refers more specifically than in Britain to a vehicle which is essentially a cold-season alternative to a carriage or wagon and has seating for passengers; what can be called a dog-sleigh in Britain is known only as a dog-sled in North America.

In Australia, where there is limited snow, ''sleigh'' and ''sledge'' are given equal preference in local parlance.

Etymology

The word ''sled'' comes from Middle English , which itself has the origins in Middle Dutch word '' slēde'', meaning 'sliding' or 'slider'. The same word shares common ancestry with both ''sleigh'' and ''sledge''. The word ''sleigh'', on the other hand, is an anglicized form of the modern Dutch word and was introduced to the English language by Dutch immigrants to North America.

Operation

Sleds are especially useful in winter but can also be drawn over wet fields, muddy roads, and even hard ground if one helps them along by greasing the blades ("grease the skids") with oil or alternatively wetting them with water. For an explanation of why sleds and other objects glide with various degrees of friction ranging from very little to fairly little friction on ice, icy snow, wet snow, and dry snow, see the relevant sections in the articles on ice and ice skating. The traditional explanation of the pressure of sleds on the snow or ice producing a thin film of water and this enabling sleds to move on ice with little friction is insufficient.

Various types of sleds are pulled by animals such as reindeer, horses, mules, oxen, or dogs.

History

The people of Ancient Egypt are thought to have used sledges (aka "skids") extensively in the construction of their public works, in particular for the transportation of heavy obelisks over sand.

Sleds and sledges were found in the Oseberg "Viking" ship excavation. The sledge was also highly prized, because – unlike wheeled vehicles – it was exempt from tolls.

Until the late 19th century, a closed winter sled, or ''vozok'', provided a high-speed means of transport through the snow-covered plains of European Russia and Siberia. It was a means of transport preferred by royals, bishops, and boyars of Muscovy. Several royal ''vozoks'' of historical importance have been preserved in the Kremlin Armoury.

Man-hauled sledges were the traditional means of transport on British exploring expeditions to the Arctic and Antarctic regions in the 19th and early 20th centuries, championed for example by Captain Scott. Dog sleds were used by most others, such as Roald Amundsen.

Modern sleds

Transport

Some of these originally used draft animals but are now more likely to be pulled by an engine (snowmobile or tractor). Some use human power.
* The word "motor sled" is colloquial term for a snowmobile
* The Inuit ''qamutiik'' is uniquely adapted for travel on the sea ice.
* The ''pulk

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