Everything about Furlong totally explained
A
furlong is a measure of
distance in
imperial units and
U.S. customary units. It is equal to one-eighth of a
mile or 660
feet or 201.168
metres.
Five furlongs are approximately 1
kilometre (1.00584 km to be exact). Since the original
definition of the
metre was one-quarter of one ten-millionth of the circumference of the Earth (along the great circle coincident with the
meridian of
Longitude passing through Paris), the circumference of the Earth is about 40,000 km or about 200,000 furlongs.
History
The name
furlong derives from the
Old English words (furrow) and (long). Dating back at least to the ninth century, it originally referred to the length of the furrow in one
acre of a ploughed
open field (a medieval communal field which was divided into strips). The system of long furrows arose because turning a team of oxen pulling a heavy plough was difficult. This offset the drainage advantages of short furrows and meant furrows were made as long as possible. An
acre is an area that's one furlong long and one
chain (22 yards) wide. For this reason, the furlong was once also called an
acre's length, though of course in modern usage an area of one
acre can be any shape.
The furlong was historically viewed as equivalent to the
Roman stade (stadium), which in turn derived from the
Greek system. For example the
King James bible will use the term "furlong" in place of the Greek "stadion", whereas modern translations will translate into miles in the main text and relate the (often very symbolic) original numbers in footnotes.
In the Roman system, there were 625 feet to the stade, eight stade to the mile, and three miles to the
league. A league was considered to be the distance a man could walk in one hour, and the mile consisted of 1000 passus (5 feet, or double-step).
After the fall of Rome, Medieval Europe continued with the Roman system, which proceeded to "diversify" leading to serious complications in trade, taxation, etc. Around the turn of the century of 1300, England by decree standardized a long list of measures. Among the important units of distance and length at the time were
foot,
yard,
rod, furlong and
mile. The rod was 5½ yards or 16½ feet (= 3 feet/yard × 5½ yards), and the mile was 8 furlongs, so the definition of the furlong became 40 rods and that of the mile became 5280 feet (= 8 furlongs × 40 rods/furlong × 16½ feet/rod ).
The official use of furlong was abolished in the United Kingdom under the
Weights and Measures Act of 1985, which also abolished from official use many other traditional units of measurement.
Use
Today the unit enjoys very limited use. Distances for
thoroughbred horse races in the
United Kingdom,
Ireland,
Canada, and the
United States are still given in miles and furlongs (
example
). It is heavily used within the rail industry (especially maintenance and repair services) in the UK, due to the legacy measurements and distance markers from when the tracks were first laid down (see
milestone). The furlong is a base unit of the humorous
FFF System of units.
The city of
Chicago's street numbering system allots a measure of
800 address units to each mile. Logically, streets were subsequently laid out 8 to the mile. This means that every block in a typical Chicago neighborhood (in either North/South or East/West direction but rarely both) is approximately one furlong in length.
Salt Lake City's blocks are also each a square furlong in the downtown area. However, the blocks are irregular in shape as one moves further out from the centre, but the numbering system remains the same (800 units to each mile) everywhere in
Salt Lake County. Bus stops in
Ann Arbor, Michigan are about a furlong apart. Blocks in central
Logan, Utah, and in large sections of Phoenix, Arizona are similarly a square furlong in extent (eight to a mile, which explains the series of freeway exits: 19th Ave, 27th, 35th, 43rd, 51st, 59th...). City blocks in
Melbourne's
Hoddle Grid are also one furlong in length.
Further Information
Get more info on 'Furlong'.
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