Cone \Cone\ (k[=o]n?), n. [L. conus cone (in sense 1), Gr.
kw^nos; 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.
[1913 Webster]
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.
[1913 Webster]
Now had Night measured with her shadowy cone
Half way up hill this vast sublunar vault. --Milton.
[1913 Webster]
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.
[1913 Webster]
4. (Zool.) A shell of the genus Conus, having a conical
form.
[1913 Webster]
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 cone or Scalene cone, a cone of which the axis is
inclined to the plane of its base.
Eight cone. See Cone, 1.
[1913 Webster]
|
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]
|