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The United States previously defined the furlong, chain, rod, and link in terms of the U.S. survey foot of exactly 1200 ⁄ 3937 metre, [14] resulting in a furlong approximately 201.1684 m long. The difference of approximately two parts per million between the old U.S. value and the "international" value was insignificant for most practical ...
The furlong–firkin–fortnight (FFF) system is a humorous system of units based on unusual or impractical measurements. The length unit of the system is the furlong , the mass unit is the mass of a firkin of water, and the time unit is the fortnight .
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
Download as PDF; Printable version; In other projects ... furlong: furlong (none) 1.0 ... To convert from feet and inches use ...
Coordinates were measured in grades on official French terrestrial ordnance charts from the French revolution well into the 20th century. 1 grade (or in modern symbology, 1 gon) = 0.9° or 0.01 right angle. One advantage of this measure is that the distance between latitude lines 0.01 gon apart at the equator is almost exactly 1 kilometre.
The UK statute chain is 22 yards, which is 66 feet (20.1168 m). This unit is a statute measure in the United Kingdom, defined in the Weights and Measures Act 1985. [6] One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm).
New conversion factors for the rod and furlong as 16.5 international feet and 660 international feet respectively have been published by NIST. [71] However, it is not clear if a "survey yard" actually exists. [72] If it did, its hypothetical values would be as follows: 3937 survey yards = 3600 meters [69] 1 survey yard ≈ 0.914 401 83 meters [69]
Elle – Ell / cubit, distance between elbow and finger tip. In the North, often 2 feet, In Prussia 17 ⁄ 8 feet, in the South variable, often 2 + 1 ⁄ 2 feet. The smallest known German elle is 402.8 mm, the longest 811 mm. Klafter – Fathom, usually 6 feet. Regional changes from 1.75 m in Baden to 3 m in Switzerland.