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Eng ID Term Definition
4461
rod: sounding
See SOUNDING POLE.
4462
rodded points
Points where the ROD was actually held, as opposed to points sketched in between.
4463
rodman
A person using a surveying ROD.
4464
Roentgen rays
See X-RAYS.
4465
roll (or rolling)
The oscillation of a ship about the longitudinal axis. In PHOTOGRAMMETRY, a rotation of a CAMERA or a photo­graph-coordinate system about ei... more
The oscillation of a ship about the longitudinal axis. In PHOTOGRAMMETRY, a rotation of a CAMERA or a photo­graph-coordinate system about either the photograph x axis or the exterior x axis.
4466
roller
An indefinite term, sometimes considered to denote one of a series of long-crested, large WAVES which roll in upon a COAST, as after a STORM... more
An indefinite term, sometimes considered to denote one of a series of long-crested, large WAVES which roll in upon a COAST, as after a STORM. Large BREAKERS on exposed COASTS formed by SWELL coming from a great distance. See COMBER.
4467
rollers: blind
See BLIND ROLLERS.
4468
roof prism
A type of prism in which the IMAGE is reverted by a roof, that is, two surfaces inclined at 90° to each other.
4469
root mean square error
See ERROR: STANDARD.
4470
rose
Name given to a COMPASS CARD, or other DIAGRAM, having radiating lines.
4471
Rossby wave(s)
Ignoring friction or depth changes; if a parcel of water with no initial relative vorticity (i.e. no rotation) is moved northward, as f (the... more
Ignoring friction or depth changes; if a parcel of water with no initial relative vorticity (i.e. no rotation) is moved northward, as f (the Corio­lis parameter) increases the parcel will gain negative relative vorticity and will circulate clock­wise. The Coriolis force will be greater on the pole­ward side of the parcel than on the equatorward side and hence the parcel will be subjected to a net south­ward restoring force. This force will push the parcel south of the latitude of zero relative vorticity overshoots and the circulation becomes counterclockwi­se. Due to the Corio­lis variation the parcel will now experience a north­ward restoring force. Thus the variation of f provides a restoring force (in the horizontal plane) allowing oscillation to occur just as the effect of gravity does (vertically) for surface or internal waves. In reality Rossby waves are compli­cated by depth variations and frictional effects.
4472
rotary current
See CURRENT.
4473
rotary stream
See CURRENT: ROTARY.
4474
rotating light
See LIGHT.
4475
rotating loop radiobeacon
See ROTATING RADIOBEACON STATION.
4476
rotating prism
See DOVE PRISM.
4477
rotating radiobeacon station
A special type of RADIO­BEACON station emitting a BEAM of WAVES to which a uniform turning movement is given, the BEARING of the station bei... more
A special type of RADIO­BEACON station emitting a BEAM of WAVES to which a uniform turning movement is given, the BEARING of the station being determined by means of an ordinary liste­ning RECEIVER and a STOP WATCH. Also referred to as rotating loop radiobeacon.
4478
rotation
Turning of a body about an AXIS within the body, as the daily rotation of the EARTH. See REVOLUTION.
4479
rotten ice
SEA ICE which has become honeycombed in the course of melting, and which is in an advanced state of disintegration.
4480
roundabout
A ROUTEING measure comprising a separation point or circular SEPARATION ZONE and a circular TRAFFIC LANE within defined limits. Traffic with... more
A ROUTEING measure comprising a separation point or circular SEPARATION ZONE and a circular TRAFFIC LANE within defined limits. Traffic within the roundabout is separated by moving in a counter-clockwise direction around the separation point or zone.