BRITISH CROWN COPYRIGHT, THE MET OFFICE / SCIENCE PHOTO LIBRARY BRITISH CROWN COPYRIGHT, THE MET OFFICE / SCIENCE PHOTO LIBRARY
Visibility recorder, also called a nephelometer. This device uses a beam of light and a light detector to measure the amount of particles suspended in a gas or liquid, in this case in the atmosphere. This allows a measure to be obtained of the degree of visibility, and how much it is reduced by meteorological phenomena such as fog, pollution, or a combination such as smog. The data gathered here is used by the Met Office, the UK's national weather monitoring and forecasting service. Photographed in the UK.
Model release not required. Property release not required.