{"version":"1.0","type":"link","title":"Secchi disk - Newikis","description":"The Secchi disk (or Secchi disc), as created in 1865 by Angelo Secchi, is a plain white, circular disk 30 cm (12 in) in diameter used to measure water transparency or turbidity in bodies of water. The disc is mounted on a pole or line and lowered slowly down in the water. The depth at which the…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://upload.wikimedia.org/wikipedia/commons/f/fe/Floating_Secchi_disk.jpg","thumbnail_width":720,"thumbnail_height":480}