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Eng ID Term Definition
3561
ocean weather station
STATION aboard a suitably equip­ped and staffed ship which tries to maintain a fixed maritime location and which observes and reports for in... more
STATION aboard a suitably equip­ped and staffed ship which tries to maintain a fixed maritime location and which observes and reports for international exchange the OBSERVATIONS of speci­fied elements.
3562
octant
A double-reflecting instrument for measuring angles. It is similar to a SEXTANT but has an arc of only 45°.
3563
ocular micrometer
See MICROMETER.
3564
odograph
A mechanical instrument containing a di­stance-measuring element which is moved or turned by an amount proportional to the actual distance t... more
A mechanical instrument containing a di­stance-measuring element which is moved or turned by an amount proportional to the actual distance travel­led; a compass element which provides a fixed-refe­rence direction, and an integrator which provides for the resolu­tion of the direction of motion into compo­nents and for the summation or integra­tion of the distance com­po­nents. Also an instrument for recording the distance travel­led by a vehicle or pedestrian.
3565
odometer (or hodometer)
An instrument for measuring the distance travelled by a craft. See also SPEEDOMETER.
3566
oersted
The CGS unit of MAGNETIC FIELD INTENSITY in the SI system.
3567
offing
That part of the visible SEA a considerable distance from the SHORE, or that part just beyond the limits of the area in which a pilot is nee... more
That part of the visible SEA a considerable distance from the SHORE, or that part just beyond the limits of the area in which a pilot is needed.
3568
offset
In SURVEYING, a short line perpendicular to a surveyed line, measured to a line or point for which DATA are desired, thus locating the secon... more
In SURVEYING, a short line perpendicular to a surveyed line, measured to a line or point for which DATA are desired, thus locating the second line or point with reference to the first or surveyed line. An offset is also a jog in a SURVEY or other line, the line having approximately the same direction both before and after passing the jog. Offsets are measured from a surveyed line or lines to the edges of an irre­gular-shaped body of water, or to any irregular line which it is desired to locate.
3569
offset lithography
A method of printing in which an image is transferred from a printing PLATE on to a rubber-surfaced blanket and thence on the paper. The ima... more
A method of printing in which an image is transferred from a printing PLATE on to a rubber-surfaced blanket and thence on the paper. The image on the plate is a RIGHT READING IMAGE.
3570
offshore
(adj. and adv.). Away from the SHORE.
3571
offshore
(n.). The comparatively flat zone of variable width which extends from the outer margin of the rather steeply sloping shoreface to the edge ... more
(n.). The comparatively flat zone of variable width which extends from the outer margin of the rather steeply sloping shoreface to the edge of the CONTINEN­TAL SHELF.
3572
offshore navigation
See NAVIGATION.
3573
offshore wind
WIND blowing from the LAND toward the SEA. See LAND BREEZE.
3574
off soundings
Said of a vessel navigating beyond the 100-FATHOM LINE. In earlier times, said of a vessel in water deeper than could be sounded with the HA... more
Said of a vessel navigating beyond the 100-FATHOM LINE. In earlier times, said of a vessel in water deeper than could be sounded with the HAND LEAD.
3575
ohm
The unit of electrical resistance in the SI system.
3576
oil field
An area in which oil occurs in quantities worthy of exploitation.
3577
old ice
Any SEA ICE more than 1 year old.
3578
omnibearing
The MAGNETIC BEARING of an OMNIRANGE.
3579
omnidirectional antenna
See ANTENNA.
3580
omnidirectional beacon
See OMNIRANGE.