The intensity and the position of the burn indicates the time and the strength of the sunshine.
A CampbellStokes sunshine recorder outside Darwin Airport Meteorological Office, in Darwin, Australia.
As the sun moved across the sky, the beam scorched a path across the wood.
Whenever the sun was hindered by clouds, the line would break.
Campbell also discovered that the hotter the sun was, the deeper was the burn.
Campbells gadget was so simple and effective that it was promptly adopted by meteorologist.
The CampbellStokes Sunshine Recorder has remained essentially unchanged since then.
Close up of a summer sunshine card for the Campbell-Stokes recorder.
The amount of sunshine is recorded in 10th’s of an hour.
Photo credit:CambridgeBayWeather/Wikimedia
A pair of CampbellStokes sunshine recorders at Cambridge Bay, Nunavut, Canada.
Photo credit:CambridgeBayWeather/Wikimedia
A CampbellStokes sunshine recorder in Wendelstein, Germany.
Photo credit:Rolf Gebhardt/Wikimedia
A CampbellStokes sunshine recorder at Sonnblick Observatory, Austria.
Photo credit:Lenz/Flickr
A CampbellStokes sunshine recorder in Antarctica.
Photo credit:Akulovz/Wikimedia
A CampbellStokes sunshine recorder on mountain Lisca near Sevnica, Slovenia.
Photo credit:romanm/Wikimedia
Sources:Wikipedia/Guardian/Atlas Obscura/Good Words
