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An altimeter in a plane is the same as a barometer on the ground. It measures atmospheric pressure. As you rise in elevation the pressure drops. The meter face has two hands like a clock, one revolution of the large pointer moves the small pointer to the first number. The large pointer reads in 20 feet intervals. One revolution of the large pointer equals 1000 feet. 10 revolutions of the large pointer equals 10000 feet. Looking at the position of the small pointer in thousands of feet and the position of the large pointer in graduations up to 1000 feet the pilot knows what his exact altitude is.There is a knurled knob on the altimeter that allows the pilot to adjust the pressure "hence the altitude" of the airport that he is at. Just before landing at an airport the pilot calls ahead to get the pressure setting of that airport, readjusts the altimeter to that airports pressure, so that he will be at the same pressure altitude as the control tower.

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