secchi disc

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• Secchi disc — a 20 30 cm diameter disc marked in 2 black and 2 white opposing quadrants, lowered into the water. The average of the depth at which it disappears from sight and the depth at which it reappears when lowered and raised in the water column is the… …   Dictionary of ichthyology

• Secchi disc reading — a measure of transparency; see Secchi disc …   Dictionary of ichthyology

• secchi disc — ˈsekē noun Usage: usually capitalized S Etymology: after Angelo Secchi died 1878 Italian astronomer : a reflective disc lowered into a body of water to permit measurement of the relative transparency of the water by recording the depth at which… …   Useful english dictionary

• Secchi disc — /ˈsɛki dɪsk/ (say sekee disk) noun a disc used to gauge water clarity by measuring the depth at which it is no longer visible from the surface. {created in 1865 by Pietro Angelo Secchi, Italian astronomer, 1818–78} …  

• Secchi disk — or Secchi disc [sek′ē] n. a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears * * * …   Universalium

• Secchi disk — or Secchi disc [sek′ē] n. a circular, white or colored disk lowered into a body of water to estimate the clarity of the water by measuring the depth at which it disappears …   English World dictionary

• Secchi depth — a measure of transparency; see Secchi disc …   Dictionary of ichthyology

• Secchi disk — The Secchi disk, created in 1865 by Pietro Angelo Secchi, is a circular disk used to measure water transparency in oceans and lakes. The disc is mounted on a pole or line, and lowered slowly down in the water. The depth at which the pattern on… …   Wikipedia

• Angelo Secchi —     Angelo Secchi     † Catholic Encyclopedia ► Angelo Secchi     Astronomer, b. at Reggio in Emilia, Italy, 18 June, 1818; d. 26 Feb., 1878. He was the son of a joiner, Antonio Secchi. His mother (née Luise Belgieri), a practical middle class… …   Catholic encyclopedia

• Enrico Caruso Compact Disc discography — Enrico Caruso with phonograph This is a list of some notable compilations of recordings of the famous Italian opera tenor Enrico Caruso (1873–1921) on compact disc. Caruso died nearly three decades before the commercial introduction of long… …   Wikipedia

• Прозрачность (гидрология) — У этого термина существуют и другие значения, см. Прозрачность. Чёрно белый диск Секки Прозрачность  показатель, характеризующий спо …   Википедия