To measure sunshine, weathermen use a Campbell Stokes sunshine recorder. This is a glass ball which concentrates sunshine on to a thick piece of card. The sunshine burns a mark on the card which shows the number of hours of sunshine in the day.

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Source: https://www.pitara.com/non-fiction-for-kids/did-you-know-for-kids/to-measure-sunshine-weathermen-use-a-campbell/

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