quadrantal spheres

quadrantal spheres: Морской термин: компенсационные шары, шары мягкого железа (у компаса)

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quadrantal corrector — Naut. either of two soft iron spheres attached to each side of a binnacle, intended to correct the compass deviation (quadrantal deviation) resulting from magnetism from ferrous metal in a ship. See diag. under binnacle1. * * * … Universalium
quadrantal correctors — noun plural : two spheres of iron attached to the port and starboard sides of the binnacle to correct the quadrantal deviation … Useful english dictionary
quadrantal corrector — Naut. either of two soft iron spheres attached to each side of a binnacle, intended to correct the compass deviation (quadrantal deviation) resulting from magnetism from ferrous metal in a ship. See diag. under binnacle1 … Useful english dictionary
Armillary sphere — An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of the celestial sphere. Description and use of the armillary sphere The exterior parts of this machine are a compages of brass rings, which represent … Wikipedia
The vector of a quaternion — In the 19th century, the vector of a quaternion written Vq was a well defined mathematical entity in the classical quaternion notation system. This article is written using classical nomenclature. In this article the word vector means the… … Wikipedia

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