The Collaborative International Dictionary
Logarithmical
Logarithmic \Log`a*rith"mic\, Logarithmical \Log`a*rith"mic*al\, a. [Cf. F. logarithmique.]
Of or pertaining to logarithms; consisting of logarithms.
Using logarithms; as, logarithmic graph paper; a logarithmic scale.
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Having a logarithm in one or more of the unknowns; -- of an equation.
Logarithmic curve (Math.), a curve which, referred to a system of rectangular co["o]rdinate 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.
Wiktionary
logarithmical
a. (alternative form of logarithmic English)