Classifier Instance:

Anchor text: US
Target Entity: United_States
Preceding Context: The aneroid altimeter is calibrated to show the pressure directly as an altitude above mean sea level, in accordance with a mathematical model defined by the International Standard Atmosphere (ISA). Older aircraft used a simple where the needle made less than one revolution around the face from zero to full scale. This design evolved to the drum-type altimeter, where each revolution of a single needle accounted for 1,000 feet, and with thousand foot increments recorded on a numerical odometer-type drum. To determine altitude, a pilot first had to read the drum to get the thousands of feet, then look at the needle for the hundreds of feet. Modern aircraft use a "sensitive altimeter," which has a primary needle, and one or more secondary needles that show the number of revolutions, similar to a clock face. In other words, each needle points to a different digit of the current altitude measurement. On a sensitive altimeter, the sea level reference pressure can be adjusted by a setting knob. The reference pressure, in inches of mercury in Canada and the
Succeeding Context: and hectopascals (previously millibars) elsewhere, is displayed in the small Kollsman window, on the face of the aircraft altimeter. This is necessary, since sea level reference atmospheric pressure at a given location varies over time with temperature and the movement of pressure systems in the atmosphere.
Paragraph Title: Use in aircraft
Source Page: Altimeter

Ground Truth Types:

Predicted Types:

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