The mercury barometer was the barometer of choice in Isaac Cline's day. It is still in wide use today. It consists of an inverted glass tube resting in a pool of mercury. Pressure forces the mercury in the pool downward, which causes mercury inside the tube to rise and fall in response to changes in the pressure outside of the tube. The deflective effect of Earth's rotation on all free-moving objects, including the atmosphere and oceans.
Deflection is to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
For example, imagine you are inside a rocket traveling in a straight line from the North Pole to the Equator. During your flight, the earth would rotate under you, so that you would land at a different longitude than where you started. Deflection is very weak near the Equator itself, which is why hurricanes cannot form within five degrees latitude of the Equator. Eye A roughly circular area of relatively light winds and fair weather at the center of a hurricane. The energy absorbed or released during a change of state.