Definitions
from The Century Dictionary.
- noun A chart on which lines, called
isogonic lines , are drawn passing through places having the same magnetic variation. See cut underisogonic .
Etymologies
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Examples
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In this voyage he determined the longitude of several places; and, after his return, constructed his variation-chart, and proposed a method of observing the longitude at sea, by means of the appulses and occultations of the fixed stars.
A General History and Collection of Voyages and Travels — Volume 14 Robert Kerr 1784
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In this voyage he determined the longitude of several places; and, after his return, constructed his variation-chart, and proposed a method of observing the longitude at sea, by means of the appulses and occultations of the fixed stars.
A Voyage Towards the South Pole and Round the World, Volume 1 James Cook 1753
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