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Difficulty: MediumWeather Elements, Instruments, and Measurements

A weather observer at a meteorological station requires a continuous visual trace of fluctuations in atmospheric pressure over a 24-hour cycle. Which instrument is designed specifically to record these continuous pressure changes on a rotating drum chart?

  1. BarographAnswer
  2. B
    Hygrograph
  3. C
    Thermograph
  4. D
    Anemograph

Answer

Barograph
The barograph is a self-recording barometer. It contains a series of aneroid capsules that expand and contract with changes in atmospheric pressure. This movement is magnified through levers to a pen arm, which draws a continuous trace (barogram) on a paper chart wrapped around a clockwork-driven rotating cylinder.

Step-by-Step Solution

1
Identify the target atmospheric parameter and measurement format requested in the stem
The target parameter is atmospheric pressure, requiring a continuous graphical record (trace chart) rather than a single instantaneous reading.
Different meteorological instruments serve specific parameters and reading methods (instantaneous vs. self-recording).
2
Match the target parameter to the corresponding self-recording weather instrument
Atmospheric pressure recorded continuously on a rotating chart drum corresponds to a barograph.
The suffix '-graph' indicates a self-recording instrument, and the prefix 'baro-' relates to atmospheric pressure.

Key Concept

Continuous Recording Weather Instruments
Estimated Time:1m 0s
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Topics

Weather Elements, Instruments, and Measurements

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