from The Century Dictionary.
- noun A diagram containing a curve generated by the motion of a line drawn from a fixed origin, and representing in direction and magnitude the horizontal component of the force of magnetism on a ship's compass-needle while the ship makes a complete circuit.
- noun A diagram that shows both the horizontal directive magnetic force of the compass-needle on board ship under local influences and its deviation from the meridian for any latitude and sailing-course; specifically, the dygogram of Captain Colongue (1870) and of A. Smith, from which Paugger obtained the idea of his mechanical dromoscope of 1872.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun nautical A
chartshowing the horizontal variationin the magneticforce acting on a ship's compass needleby the ironwithin the ship, as a function of coursesteered
from Wiktionary, Creative Commons Attribution/Share-Alike License
From dynamic + goniometric + diagram
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