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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.
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The Regina Company was eventually acquired by Philips Electronics in 1995. Oreck bought the company in 1997, and in 2000, it was sold to the Royal Corporation, the owners of the Dirt Devil brand, which sold the vacuums under the Home Depot brand for a few years. [4] In 2020 Regina Vacuum LLC relaunched the Regina brand, offering a vacuum ...
CCleaner (/ ˈsiːˌkliːnər /; originally Crap Cleaner), [6] developed by Piriform Software, is a utility used to clean potentially unwanted files and invalid Windows Registry entries from a computer. It is one of the longest-established system cleaners, first launched in 2004. [7] It was originally developed for Microsoft Windows only, [8 ...
Tape head cleaner. A tape head cleaner is a substance or device used for cleaning the record and playback heads of a magnetic tape drive found in video or audio tape machines such as cassette players and VCRs. [1] These machines require regular maintenance to perform properly.