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Eng ID Term Definition
3741
passage
A narrow navigable CHANNEL, especially one through REEFS or ISLANDS. Sometimes called a PASS, or in New England waters a HOLE.
3742
passage: meridian
See MERIDIAN TRANSIT.
3743
passive system
A system which records energy emitted or reflected but does not produce or transmit energy of its own.
3744
passometer
A pocket-size instrument which registers the number of steps taken by the pedestrian carrying it. See PEDOMETER.
3745
pass point
In PHOTOGRAM­METRY, a point whose horizon­tal and/or vertical position is determined from PHOTO­GRAPHS by photogrammetrical methods and w... more
In PHOTOGRAM­METRY, a point whose horizon­tal and/or vertical position is determined from PHOTO­GRAPHS by photogrammetrical methods and which is inten­ded for use (as in the manner of a SUPPLEMENTAL CONTROL POINT) in the ORIENTATION of other PHOTO­GRAPHS.
3746
patch
In ice terminology, a collection of PACK ICE, less than 10 km across.
3747
patent log
See LOG.
3748
path
A line of movement; course taken, as the path of a METEOR. A line connecting a series of points in space and constituting a proposed or trav... more
A line of movement; course taken, as the path of a METEOR. A line connecting a series of points in space and constituting a proposed or travelled route.
3749
pattern
See LATTICE.
3750
P-code
The Precise (or Protected) GPS code; a very long (about 1014 bit) sequence of pseudo-random binary biphase modulations on the GPS carrier at... more
The Precise (or Protected) GPS code; a very long (about 1014 bit) sequence of pseudo-random binary biphase modulations on the GPS carrier at a chip rate of 10.23 Mhz which does not repeat itself for about 267 days. Each one-week segment of the P-code is unique to one GPS satellite and is reset each week. See also C/A CODE.
3751
peak
A prominent elevation either pointed or of very limited extent across the SUMMIT. Also called pike.
3752
pebble
A small STONE worn smooth and rounded by the action of water, SAND, ICE, etc. ranging in diameter between 4 and 64 millimetres.
3753
pecked line
In CARTOGRAPHY, a SYMBOL consisting of a line broken at regular intervals.
3754
pedometer
A pocket-size instrument which registers in linear units the distance traversed by the pedestrian carrying it. See PASSOMETER.
3755
pelagic-abyssal sediments
Deep sea SEDIMENTS that are free of terrestrial material except for a small pro­portion of very fine CLAY.
3756
pelagic division
In the classification of the marine environment and its inhabitants, a primary division of the SEA which includes the whole mass of water. T... more
In the classification of the marine environment and its inhabitants, a primary division of the SEA which includes the whole mass of water. The division is made up of the neritic province which includes that water shallower than 200 METRES, and the oceanic province which includes that water deeper than 200 METRES. The other primary division of the SEA is the BENTHIC DIVISION.
3757
pelorus
A COMPASS CARD in the form of a metal plate mounted in GIMBALS to maintain a horizontal position and fitted with SIGHT-VANES for observing B... more
A COMPASS CARD in the form of a metal plate mounted in GIMBALS to maintain a horizontal position and fitted with SIGHT-VANES for observing BEARINGS where direct use of the COMPASS for this purpose is impracticable. Also called dumb compass or bearing plate. See also ALIDADE.
3758
pencil
In optics, a set of RAYS coming to or sprea­ding out from a point. See LIGHT PENCIL.
3759
pencil beam
A BEAM in which the RADIANT ENERGY is concentrated in an ap­proximately conical or cylindrical portion of space of relatively small diamete... more
A BEAM in which the RADIANT ENERGY is concentrated in an ap­proximately conical or cylindrical portion of space of relatively small diameter. This type beam is used for many revolving navigational LIGHTS.
3760
pendulum
A body so suspen­ded from a fixed point as to swing freely to and from under the combined forces of GRAVITY and MOMENTUM. A vertical bar so... more
A body so suspen­ded from a fixed point as to swing freely to and from under the combined forces of GRAVITY and MOMENTUM. A vertical bar so supported from below by a stiff spring as to vibrate to and for under the combined action of GRAVITY and the restoring force of the spri­ng.