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Guide meridian
(gcide) | Guide \Guide\, n. [OE. giae, F. guide, It. guida. See Guide,
v. t.]
1. A person who leads or directs another in his way or
course, as in a strange land; one who exhibits points of
interest to strangers; a conductor; also, that which
guides; a guidebook.
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2. One who, or that which, directs another in his conduct or
course of life; a director; a regulator.
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He will be our guide, even unto death. --Ps. xlviii.
14.
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3. Any contrivance, especially one having a directing edge,
surface, or channel, for giving direction to the motion of
anything, as water, an instrument, or part of a machine,
or for directing the hand or eye, as of an operator; as:
(a) (Water Wheels) A blade or channel for directing the
flow of water to the wheel buckets.
(b) (Surgery) A grooved director for a probe or knife.
(c) (Printing) A strip or device to direct the
compositor's eye to the line of copy he is setting.
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4. (Mil.) A noncommissioned officer or soldier placed on the
directing flank of each subdivision of a column of troops,
or at the end of a line, to mark the pivots, formations,
marches, and alignments in tactics. --Farrow.
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Guide bar (Mach.), the part of a steam engine on which the
crosshead slides, and by which the motion of the piston
rod is kept parallel to the cylinder, being a substitute
for the parallel motion; -- called also guide, and
slide bar.
Guide block (Steam Engine), a block attached in to the
crosshead to work in contact with the guide bar.
Guide meridian. (Surveying) See under Meridian.
Guide pile (Engin.), a pile driven to mark a place, as a
point to work to.
Guide pulley (Mach.), a pulley for directing or changing
the line of motion of belt; an idler. --Knight.
Guide rail (Railroads), an additional rail, between the
others, gripped by horizontal driving wheels on the
locomotive, as a means of propulsion on steep gradients.
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Guide meridian
(gcide) | Meridian \Me*rid"i*an\, n. [F. m['e]ridien. See Meridian, a.]
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1. Midday; noon.
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2. Hence: The highest point, as of success, prosperity, or
the like; culmination.
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I have touched the highest point of all my
greatness,
And from that full meridian of my glory
I haste now to my setting. --Shak.
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3. (Astron.) A great circle of the sphere passing through the
poles of the heavens and the zenith of a given place. It
is crossed by the sun at midday.
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4. (Geog.) A great circle on the surface of the earth,
passing through the poles and any given place; also, the
half of such a circle included between the poles.
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Note: The planes of the geographical and astronomical
meridians coincide. Meridians, on a map or globe, are
lines drawn at certain intervals due north and south,
or in the direction of the poles.
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Calculated for the meridian of, or {fitted to the meridian
of}, or adapted to the meridian of, suited to the local
circumstances, capabilities, or special requirements of.
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All other knowledge merely serves the concerns of
this life, and is fitted to the meridian thereof.
--Sir M. Hale.
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First meridian or prime meridian, the meridian from which
longitudes are reckoned. The meridian of Greenwich is the
one commonly employed in calculations of longitude by
geographers, and in actual practice, although in various
countries other and different meridians, chiefly those
which pass through the capitals of the countries, are
occasionally used; as, in France, the meridian of Paris;
in the United States, the meridian of Washington, etc.
Guide meridian (Public Land Survey), a line, marked by
monuments, running North and South through a section of
country between other more carefully established meridians
called principal meridians, used for reference in
surveying. [U.S.]
Magnetic meridian, a great circle, passing through the
zenith and coinciding in direction with the magnetic
needle, or a line on the earth's surface having the same
direction.
Meridian circle (Astron.), an instrument consisting of a
telescope attached to a large graduated circle and so
mounted that the telescope revolves like the transit
instrument in a meridian plane. By it the right ascension
and the declination of a star may be measured in a single
observation.
Meridian instrument (Astron.), any astronomical instrument
having a telescope that rotates in a meridian plane.
Meridian of a globe, or Brass meridian, a graduated
circular ring of brass, in which the artificial globe is
suspended and revolves.
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