Split pulley

Split \Split\, a.
   1. Divided; cleft.
      [1913 Webster]

   2. (Bot.) Divided deeply; cleft.
      [1913 Webster]

   3. (Exchanges)
      (a) Divided so as to be done or executed part at one time
          or price and part at another time or price; -- said of
          an order, sale, etc.
      (b) Of quotations, given in sixteenth, quotations in
          eighths being regular; as, 103/16 is a split
          quotation.
      (c) (London Stock Exchange) Designating ordinary stock
          that has been divided into preferred ordinary and
          deferred ordinary.
          [Webster 1913 Suppl.]

   {Split pease}, hulled pease split for making soup, etc.

   {Split pin} (Mach.), a pin with one end split so that it may
      be spread open to secure it in its place.

   {Split pulley}, a parting pulley. See under {Pulley}.

   {Split ring}, a ring with overlapped or interlocked ends
      which may be sprung apart so that objects, as keys, may be
      strung upon the ring or removed from it.

   {Split ticket}, a ballot in which a voter votes for a portion
      of the candidates nominated by one party, candidates of
      other parties being substituted for those omitted. [U.S.]
      [1913 Webster +PJC]
    

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.
   [1913 Webster]

   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.
         [1913 Webster]

   {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.
      [1913 Webster]