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 for Differential coupling
From The Collaborative International Dictionary of English v.0.48 :

  differential \dif`fer*en"tial\, a. [Cf. F. diff['e]rentiel.]
     1. Relating to or indicating a difference; creating a
        difference; discriminating; special; as, differential
        characteristics; differential duties; a differential rate.
        [1913 Webster]
              For whom he produced differential favors. --Motley.
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     2. (Math.) Of or pertaining to a differential, or to
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     3. (Mech.) Relating to differences of motion or leverage;
        producing effects by such differences; said of mechanism.
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     Differential calculus. (Math.) See under Calculus.
     Differential coefficient, the limit of the ratio of the
        increment of a function of a variable to the increment of
        the variable itself, when these increments are made
        indefinitely small.
     Differential coupling, a form of slip coupling used in
        light machinery to regulate at pleasure the velocity of
        the connected shaft.
     Differential duties (Polit. Econ.), duties which are not
        imposed equally upon the same products imported from
        different countries.
     Differential galvanometer (Elec.), a galvanometer having
        two coils or circuits, usually equal, through which
        currents passing in opposite directions are measured by
        the difference of their effect upon the needle.
     Differential gearing, a train of toothed wheels, usually an
        epicyclic train, so arranged as to constitute a
        differential motion.
     Differential motion, a mechanism in which a simple
        differential combination produces such a change of motion
        or force as would, with ordinary compound arrangements,
        require a considerable train of parts. It is used for
        overcoming great resistance or producing very slow or very
        rapid motion.
     Differential pulley. (Mach.)
        (a) A portable hoisting apparatus, the same in principle
            as the differential windlass.
        (b) A hoisting pulley to which power is applied through a
            differential gearing.
     Differential screw, a compound screw by which a motion is
        produced equal to the difference of the motions of the
        component screws.
     Differential thermometer, a thermometer usually with a
        U-shaped tube terminating in two air bulbs, and containing
        a colored liquid, used for indicating the difference
        between the temperatures to which the two bulbs are
        exposed, by the change of position of the colored fluid,
        in consequence of the different expansions of the air in
        the bulbs. A graduated scale is attached to one leg of the
     Differential windlass, or Chinese windlass, a windlass
        whose barrel has two parts of different diameters. The
        hoisting rope winds upon one part as it unwinds from the
        other, and a pulley sustaining the weight to be lifted
        hangs in the bight of the rope. It is an ancient example
        of a differential motion.
        [1913 Webster]

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