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Eng ID Term Definition
2581
isobathytherm
A line or surface showing the DEPTHS in OCEANS or LAKES at which points have the same tempera­ture. Isobathytherms are usually drawn to show... more
A line or surface showing the DEPTHS in OCEANS or LAKES at which points have the same tempera­ture. Isobathytherms are usually drawn to show cross sections of the water mass.
2582
isobront
Line joining, on a CHART, places on the EARTH's surface where, on a given day, the first clap of THUNDER has been heard simultaneously. In ... more
Line joining, on a CHART, places on the EARTH's surface where, on a given day, the first clap of THUNDER has been heard simultaneously. In CLIMATOLOGY, line drawn on a CHART through places which have the same average number of days on which THUNDER is heard in a given period.
2583
isocentre
The unique point common to the plane of a PHOTOGRAPH, its PRINCIPAL PLANE, and the plane of an assumed truly VERTICAL PHOTOGRAPH taken from ... more
The unique point common to the plane of a PHOTOGRAPH, its PRINCIPAL PLANE, and the plane of an assumed truly VERTICAL PHOTOGRAPH taken from the same CAMERA STATION and having an equal PRINCIPAL DISTAN­CE. The point of intersection on a PHOTOGRAPH of the true PRINCIPAL LINE and the ISOMETRIC PARALLEL. The point on a PHOTOGRAPH intersected by the bisector of the angle between the PLUMB LINE and the photo­graph perpendicular. The isocentre is significant because it is the centre of radiation for DISPLACE­MENTS of IMAGES caused by TILT.
2584
isoclinal (or isoclinic)
(adj.). Of or pertaining to equal MAGNETIC DIP.
2585
isoclinal
n.). See ISOCLINAL LINE.
2586
isoclinal (or isoclinic) line
A line connecting points of equal MAGNETIC DIP. Also called isoclinal.
2587
isodynamic
(adj.). Of or pertaining to equality of force.
2588
isodynamic line
A line connecting points of equal MAGNETIC INTENSITY, either the total or any compo­nent.
2589
isogon
Line which is the locus of points at which the DIRECTION OF WIND is the same.
2590
isogonal (or isogonic)
(adj.). Having equal angles.
2591
isogonal (or isogonic)
(n.). See ISOGONIC LINE.
2592
isogonic line
A line connecting points of equal magne­tic VARIATION. Also called isogonal (or iso­gonic).
2593
isogram
That line on a CHART or DIAGRAM connecting points having equal values of same PHENOMENON.
2594
isogriv
A line connecting points of equal GRID VARIA­TION.
2595
isohaline (or isohalsine)
A line connecting points of equal SALINITY in the OCEAN.
2596
isohalsine
See ISOHALINE.
2597
isolated danger mark
In the IALA Maritime Buoyage System a NAVIGATION MARK erected on, moored over, or placed immediately adjacent to an isolated danger of limi... more
In the IALA Maritime Buoyage System a NAVIGATION MARK erected on, moored over, or placed immediately adjacent to an isolated danger of limited extent, which has NAVIGABLE WATER all around it.
2598
isoline
A line representing the intersection of the plane of a VERTICAL PHOTOGRAPH with the plane of an overlapping OBLIQUE PHOTOGRAPH. If the VERTI... more
A line representing the intersection of the plane of a VERTICAL PHOTOGRAPH with the plane of an overlapping OBLIQUE PHOTOGRAPH. If the VERTICAL PHOTO­GRAPH were tilt-free, the isoline would be the ISOME­TRIC PARALLEL of the OBLIQUE PHOTOGRAPH.
2599
isomagnetic
(adj.). Of or pertaining to lines connecting points of equality in some MAGNETIC ELEMENT.
2600
isomagnetic
(n.). See ISOMAGNETIC LINE.