BUYS 

BALLOT'S LAW, in meteorology, the name given to a law which may be expressed as follows:—" Stand with your back to the wind; the low-pressure area will be on your left-hand." This rule, the truth of which was first recognized by the American meteorologists J . H . Coffin and W . Ferrel, is a direct consequence of Ferrel's Law (q.v.) . It is approximately true in the higher latitudes of the Northern Hemisphere, and is reversed in the Southern Hemisphere, but the angle between barometric gradient and wind is not a right angle in low latitudes . The law takes its name from C . H . D . Buys Ballott, a Dutch meteorologist, who published it in the Comptes rendus, November 1857 .