The harmonic mean is the special case of the power mean and is one of the Pythagorean means. In older literature, it is sometimes called the subcontrary mean. The volume-to-surface area ratio for a cylindrical container with height and radius and the mean curvature of a general surface are related to the harmonic mean.
The name SMITH is probably the most common of all surnames. The only names that give it any competition for this title would be Jones and Johnson. The most widely accepted derivation of the name is from the Anglo-Saxon SMITAN and the Germanic verb âSmioanâ meaning to smite or strike.
The second possible origin is as a shortened form of Black-Smith, a worker in cold metals, as distinct from a White (Smith), one who worked in hot metals. The surname was popular in Scotland from the 15th Century. Adam Black of Edinburgh (1784 - 1874), a publisher, acquired the rights to the Encyclopedia Britannica in 1827. No less than ten Coats of Arms were granted to families of this name.