isogamn.

/ˈʌɪsəʊɡam/

Etymology: apparently < iso- comb. form + gam- (in gamma n.).

1. A line (imaginary or on a map) connecting points where the acceleration due to gravity has the same value. Frequently attributive.

ΘΚΠ

the world > the earth > earth sciences > geography > map-making > map > [noun] > line on map > gravity

isogam1928

1928 Science 13 July 37 Isogam, surface or line of equal gravitative attraction.

1931 F. H. Lahee Field Geol. (ed. 3) xxiii. 661 Isogam is the name applied to lines of equal value of relative or absolute gravity. Isogam maps.. are used to picture the variation of gravity.

1940 Geogr. Jrnl. 95 135 The gravity pendulum..cannot produce a survey of gravity in which isogams at 2 milligal intervals can be drawn with confidence.

1954 Monthly Notices Royal Astron. Soc.: Geophysical Suppl. 6 180 The easiest approach to the problem..is to prepare a chart of density anomalies..and next an isogam chart of the gravity effect of these density anomalies.

2. [compare gamma n. 10 (iv).] An isodynamic line.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > [noun] > lines on maps or diagrams

isoclinal1889

isogonic1892

isogam1940

1940 L. L. Nettleton Geophysical Prospecting for Oil viii. 163 Contours, or lines of equal magnetic intensity, are commonly called ‘isogams’.

1965 G. J. Williams Econ. Geol. N.Z. xix. 354/2 A recent magnetic survey revealed a group of high values corresponding fairly well with the inferred position of the anticline; the trend of the isogams and of the high axis is almost parallel to that of the axis.

This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2022).

单词	isogam
释义	isogamn. /ˈʌɪsəʊɡam/ Etymology: apparently < iso- comb. form + gam- (in gamma n.). 1. A line (imaginary or on a map) connecting points where the acceleration due to gravity has the same value. Frequently attributive. ΘΚΠ the world > the earth > earth sciences > geography > map-making > map > [noun] > line on map > gravity isogam1928 1928 Science 13 July 37 Isogam, surface or line of equal gravitative attraction. 1931 F. H. Lahee Field Geol. (ed. 3) xxiii. 661 Isogam is the name applied to lines of equal value of relative or absolute gravity. Isogam maps.. are used to picture the variation of gravity. 1940 Geogr. Jrnl. 95 135 The gravity pendulum..cannot produce a survey of gravity in which isogams at 2 milligal intervals can be drawn with confidence. 1954 Monthly Notices Royal Astron. Soc.: Geophysical Suppl. 6 180 The easiest approach to the problem..is to prepare a chart of density anomalies..and next an isogam chart of the gravity effect of these density anomalies. 2. [compare gamma n. 10 (iv).] An isodynamic line. ΘΚΠ the world > matter > physics > electromagnetic radiation > magnetism > earth magnetism > [noun] > lines on maps or diagrams isoclinal1889 isogonic1892 isogam1940 1940 L. L. Nettleton Geophysical Prospecting for Oil viii. 163 Contours, or lines of equal magnetic intensity, are commonly called ‘isogams’. 1965 G. J. Williams Econ. Geol. N.Z. xix. 354/2 A recent magnetic survey revealed a group of high values corresponding fairly well with the inferred position of the anticline; the trend of the isogams and of the high axis is almost parallel to that of the axis. This entry has not yet been fully updated (first published 1976; most recently modified version published online June 2022). < n.1928
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