logarithmical

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CIDE DICTIONARY

logarithmical, a. [Cf. F. logarithmique.].

Of or pertaining to logarithms; consisting of logarithms. [1913 Webster]
Using logarithms; as, logarithmic graph paper; a logarithmic scale. [PJC]
Having a logarithm in one or more of the unknowns; -- of an equation. [PJC]

Logarithmic curve (Math.), a curve which, referred to a system of rectangular coördinate axes, is such that the ordinate of any point will be the logarithm of its abscissa. -- Logarithmic spiral, a spiral curve such that radii drawn from its pole or eye at equal angles with each other are in continual proportion. See Spiral.