English Dictionary

Mr. Ralph Abercromby has made special observations on the upper wind currents over the equator in the Atlantic Ocean. … With respect to the general circulation of the atmosphere we know that the surface trades either die out at the doldrums or unite into one moderate east current; that the low and middle currents over the doldrums are very variable, but that the winds at these low and middle levels, 2,000 to 20,000 feet, come usually from the southeast over the northeast trade, and from the northeast over the southeast trade, and that the highest currents—over 20,000 feet—move from east over the doldrums, from southwest over the northeast trade, and from northwest over the southeast trade.