A wheelbarrow is a small hand-propelled vehicle, usually with just one wheel, designed to be pushed and guided by a single person using two handles at the rear, or by a sail to push the ancient wheelbarrow by wind. The term "wheelbarrow" is made of two words: "wheel" and "barrow." "Barrow" is a derivation of the Old English "bearwe" which was a device used for carrying loads.
The wheelbarrow is designed to distribute the weight of its load between the wheel and the operator so enabling the convenient carriage of heavier and bulkier loads than would be possible were the weight carried entirely by the operator. As such it is a second-class lever. Traditional Chinese wheelbarrows, however, had a central wheel supporting the whole load. Use of wheelbarrows is common in the construction industry and in gardening. Typical capacity is approximately 100 liters (4 cubic feet) of material.
A two-wheel type is more stable on level ground, while the almost universal one-wheel type has better maneuverability in small spaces, on planks or when tilted ground would throw the load off balance. The use of one wheel also permits greater control of the deposition of the load on emptying.
The Wheelbarrow is a remotely controlled robot designed in 1972 for use by British Army bomb disposal teams operating in Northern Ireland (321 EOD), mainland Britain (11 EOD Regiment) and Iraq. Over 400 have been destroyed in operation, and they are considered to have saved the lives of hundreds.
A retired Lieutenant-Colonel of the Royal Tank regiment, Peter Miller (1912 – 2006) conceived the idea in the aftermath of a period (1971 – 72) when the Royal Army Ordnance Corps (RAOC) lost eight ATOs (Ammunition Technical Officers) on active duty in Northern Ireland: an appalling rate of attrition due to the limited options available to an operator faced with an IED. Tasked with finding a solution by Colonel George Styles, Miller "remembered that [he] had invented a delightful labour-saving technique when [he] modified my lawnmower. This seemed a possible solution to the problem, so [he] went to a local garden centre with the intention of buying a gutted lawnmower. The sales manager suggested that the chassis of an electrically powered wheelbarrow might be suitable. [He] thought it was ideal and bought one on the spot."
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