Sunshine duration is determined by burning marks on a card with hourly intervals; which device records this?

Sunshine duration is determined by burning marks on a card with hourly intervals; which device records this?

• A. Barometer
• B. Campbell Stokes recorder
• C. Hygrometer
• D. Anemometer

Answer: (B)

The Campbell Stokes recorder records sunshine duration by using a glass sphere to focus sunlight onto a card. When the sun is bright, its rays burn marks on the card, and the card is marked with hourly intervals so you can read how many hours of sunshine occurred. This direct recording of sun exposure is what distinguishes it from the other instruments, which measure atmospheric pressure, humidity, or wind speed rather than sunlight.

The Campbell Stokes recorder records sunshine duration by using a glass sphere to focus sunlight onto a card. When the sun is bright, its rays burn marks on the card, and the card is marked with hourly intervals so you can read how many hours of sunshine occurred. This direct recording of sun exposure is what distinguishes it from the other instruments, which measure atmospheric pressure, humidity, or wind speed rather than sunlight.