1 / 10

Weather Instruments

Weather Instruments. IGCSE Geography. Temperature. Max Min Thermometer Six’s Thermometer Max-Mercury Min-Alcohol Measures shade temperature (Stevenson’s screen) Read off at bottom of the index (reset with magnet) Read at eye level Measured in ºC. Humidity. Wet/Dry Bulb thermometer

winter
Download Presentation

Weather Instruments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Weather Instruments IGCSE Geography

  2. Temperature • Max Min Thermometer • Six’s Thermometer • Max-Mercury • Min-Alcohol • Measures shade temperature (Stevenson’s screen) • Read off at bottom of the index (reset with magnet) • Read at eye level • Measured in ºC

  3. Humidity • Wet/Dry Bulb thermometer • Hygrometer • Wick and reservoir of water • Comparison tables • Calculate depression of wet bulb (Dry – Wet) • Read off table • Measures in shade (Stevenson’s screen) • Units = % Relative humidity

  4. Wind Speed • Anemometer • Cups or blades • Clear unobstructed location • Km per hour

  5. Wind Direction • Wind Vane • Recorded on Wind Rose • Compass Directions

  6. Air Pressure • Aneoid Barometer • Barograph • Plots changes in pressure • Millibars • Measured in shade (Stevenson’s screen)

  7. Rainfall • Rain gauge • Siting factors • Clear view of sky • Recessed into ground • Approx 30cm above ground • Grassy surface (avoid splash back) • Read off at eye level • Regular intervals (24hours)

  8. Sunshine • Sunshine recorder • Burns a timeline • Traces sun shine not hours of daylight • Glass ball focuses light • Burns line onto card • Units = Hours

  9. Stevenson’s Screen • Houses temperature / humidity /pressure instruments • Features • Insulated roof • Painted white to reflect heat • Louvered (slatted) sides aid air circulation • Located 1.25-2m above ground

  10. Cloud Cover • Cloud Mirror • Divide mirror into 16 equal squares • Lay mirror on ground with clear view of sky • Estimate cover • Units = Oktas

More Related