Weather Instruments 🌡️ Flashcards
What is an instruments that can measure sunshine?
Campbell Stokes Recorder
• Measures hours of sunshine each day
• A solid ball
• Concentrate the sun’s rays onto a removable strip
• Rays scorch card
• Different parts are scorched as sun changes position
• Card is marked off in hours, so that the scorch marks reveal when and for how long the sun is shining
What is an instrument that can measure rainfall?
Rain gauge
• Measures precipitation in mm
• Outer cylinder
• Partially buried in ground
• Spot away from buildings or trees
• Outer cylinder has a funnel directing water into a measuring cylinder
• Measuring cylinder shows rainfall in mm
What is an instrument that can measure pressure?
Atmospheric pressure
• An aneroid barometer measures atmospheric pressure
• It consists of a hollow metal box with a vacuum
• Air enters the vacuum and a needle attached to the box indicates the pressure of the air in the box
• Pressure is measured in millibars or hectopascals
• Isobars are the lines on a map that join places of equal pressure
What is an instrument that can measure humidity?
Web and dry bulb thermometer
• One thermometer is dry and measures the air temperature
• Other bulb is wet by a cloth cover dipping into water
• Difference in temperature indicates the relative humidity
What is an instrument that can measure wind?
Wind vane
• Free moving arrow on high mast
• Tail is wide and blown forward by wind
• Arrow points direction from which wind blows
