{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}.
{Artificial}, or {Logarithmic}, {tangent}, the logarithm of
the natural tangent of an arc.
{Natural tangent}, a decimal expressing the length of the
tangent of an arc, the radius being reckoned unity.
{Tangent galvanometer} (Elec.), a form of galvanometer having
a circular coil and a short needle, in which the tangent
of the angle of deflection of the needle is proportional
to the strength of the current.
{Tangent of an angle}, the natural tangent of the arc
subtending or measuring the angle.
{Tangent of an arc}, a right line, as ta, touching the arc of
a circle at one extremity a, and terminated by a line ct,
passing from the center through the other extremity o.