Moody friction factor
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The Moody friction factor is a misnomer arising from the use of the Moody chart or Moody diagramme (after L. F. Moody) to plot values of friction factor as a function of Reynolds number and relative roughness.
http://img95.imageshack.us/img95/1958/moodydr8.png
L.F. Moody, "Friction factors for pipe flow," Trans. ASME, vol. 66, 1944.
However, the two different friction factors, which differ by a factor of 4, are the Darcy friction factor and the Fanning friction factor. Moody's original publication used the Darcy friction factor, and so this is the more common equivalence used.
