A Mathematical and Philosphical Dictionary
, in Mechanics, a term applied by Musschenbroek to an instrument invented by him for measuring the friction of metals. It consists of an axis formed of hard steel, passing through a cylindrical piece of wood: the ends of the axis, which are highly polished, are made to rest on the polished semicircular cheeks of various metals, and the degree of friction is estimated by means of a weight suspended by a fine silken string or ribband over the wooden cylinder. For a farther description and the figure of this instrument, with the results of various experiments performed with it, see Musschenb. Introd. ad Phil. Nat. vol. 1, p. 151.