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Secchi disk. The modified Secchi disk design used in fresh water. 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.
Angelo Secchi S.J. (Italian pronunciation: [ˈandʒelo ˈsekki]; 28 June 1818 – 26 February 1878) was an Italian Catholic priest and astronomer from the Italian region of Emilia. [1] He was director of the observatory at the Pontifical Gregorian University (then called the Roman College ) for 28 years.
Forel-Ule scale. A researcher uses a Forel-Ule scale to measure the transparency and color of water in Kyiv and Kaniv reservoirs, Ukraine. Illustration of the Forel-Ule Scale on a pamphlet titled “Colors of the Sea” in Dutch. The Forel-Ule scale is a method to estimate the color of bodies of water. The scale provides a visual estimate of ...
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George C. Whipple. Water Industry Hall of Fame, American Water Works Association, 1973. George Chandler Whipple (March 2, 1866 – November 27, 1924) was an American civil engineer and an expert in the field of sanitary microbiology. His career extended from 1889 to 1924 and he is best known as a co-founder of the Harvard School of Public Health.
This is an incomplete list of notable applications (apps) that run on iOS where source code is available under a free software/open-source software license.Note however that much of this software is dual-licensed for non-free distribution via the iOS app store; for example, GPL licenses are not compatible with the app store.