资料来源 : Webster's Revised Unabridged Dictionary (1913)

Pulley \Pul"ley\, n.; pl. {Pulleys}. [F. poulie, perhaps of
   Teutonic origin (cf. {Poll}, v. t.); but cf. OE. poleine,
   polive, pulley, LL. polanus, and F. poulain, properly, a
   colt, fr. L. pullus young animal, foal (cf. {Pullet},
   {Foal}). For the change of sense, cf. F. poutre beam,
   originally, a filly, and E. easel.] (Mach.)
   A wheel with a broad rim, or grooved rim, for transmitting
   power from, or imparting power to, the different parts of
   machinery, or for changing the direction of motion, by means
   of a belt, cord, rope, or chain.

   Note: The pulley, as one of the mechanical powers, consists,
         in its simplest form, of a grooved wheel, called a
         sheave, turning within a movable frame or block, by
         means of a cord or rope attached at one end to a fixed
         point. The force, acting on the free end of the rope,
         is thus doubled, but can move the load through only
         half the space traversed by itself. The rope may also
         pass over a sheave in another block that is fixed. The
         end of the rope may be fastened to the movable block,
         instead of a fixed point, with an additional gain of
         power, and using either one or two sheaves in the fixed
         block. Other sheaves may be added, and the power
         multiplied accordingly. Such an apparatus is called by
         workmen a block and tackle, or a fall and tackle. See
         {Block}. A single fixed pulley gives no increase of
         power, but serves simply for changing the direction of
         motion.

   {Band pulley}, or {Belt pulley}, a pulley with a broad face
      for transmitting power between revolving shafts by means
      of a belt, or for guiding a belt.

   {Cone pulley}. See {Cone pulley}.

   {Conical pulley}, one of a pair of belt pulleys, each in the
      shape of a truncated cone, for varying velocities.

   {Fast pulley}, a pulley firmly attached upon a shaft.

   {Loose pulley}, a pulley loose on a shaft, to interrupt the
      transmission of motion in machinery. See {Fast and loose
      pulleys}, under {Fast}.

   {Parting pulley}, a belt pulley made in semicircular halves,
      which can be bolted together, to facilitate application
      to, or removal from, a shaft.

   {Pulley block}. Same as {Block}, n. 6.

   {Pulley stile} (Arch.), the upright of the window frame into
      which a pulley is fixed and along which the sash slides.
      

   {Split pulley}, a parting pulley.

Cone \Cone\, n. [L. conus cone (in sense 1), Gr. ?; akin to Skr.
   [,c]ana whetstone, L. cuneus wedge, and prob. to E. hone. See
   {Hone}, n.]
   1. (Geom.) A solid of the form described by the revolution of
      a right-angled triangle about one of the sides adjacent to
      the right angle; -- called also a {right cone}. More
      generally, any solid having a vertical point and bounded
      by a surface which is described by a straight line always
      passing through that vertical point; a solid having a
      circle for its base and tapering to a point or vertex.

   2. Anything shaped more or less like a mathematical cone; as,
      a volcanic cone, a collection of scori[ae] around the
      crater of a volcano, usually heaped up in a conical form.

            Now had Night measured with her shadowy cone Half
            way up hill this vast sublunar vault. --Milton.

   3. (Bot.) The fruit or strobile of the {Conifer[ae]}, as of
      the pine, fir, cedar, and cypress. It is composed of woody
      scales, each one of which has one or two seeds at its
      base.

   4. (Zo["o]l.) A shell of the genus {Conus}, having a conical
      form.

   {Cone of rays} (Opt.), the pencil of rays of light which
      proceed from a radiant point to a given surface, as that
      of a lens, or conversely.

   {Cone pulley}. See in the Vocabulary.

   {Oblique} or {Scalene cone}, a cone of which the axis is
      inclined to the plane of its base.

   {Eight cone}. See {Cone}, 1.

Cone pulley \Cone" pul"ley\
   A pulley for driving machines, etc., having two or more parts
   or steps of different diameters; a pulley having a conical
   shape.