His model also predicted rapid easterly trade winds of around , though he argued that the action of surface friction over the course of a few days slowed the air to the observed wind speeds. Colin Maclaurin extended Hadley's model to the ocean in 1740, asserting that meridional ocean currents were subject to similar westward or eastward deflections.
His model predicted strong easterly trade winds, though he believed surface friction over a few days would slow them down to the observed speeds. Colin Maclaurin expanded Hadley's work by applying it to the ocean in 1740, suggesting that ocean currents also experience similar westward or eastward deviations.