Secchin.

/ˈsɛki/

Forms: Also secchi.

Etymology: < the name of Angelo Secchi (1818–78), Italian astronomer.

Secchi('s) disc: a type of opaque white disc which is used in determining the transparency of water; the disc, maintained in a horizontal attitude, is allowed to sink and the depth at which it ceases to be visible from the surface is recorded. Secchi and Cialdi first described the use of discs of this kind in 1865 ( Compt. Rend. LXI. 101).

ΘΚΠ

the world > matter > light > transparency or translucence > [noun] > tool to determine transparency

Secchi('s) disc1913

1913 Science 14 Nov. 703/1 The inland lakes of Wisconsin are not very transparent; the transparency, as shown by Secchi's disk, varying from less than 1 m. to about 7 m.

1931 Trans. Wisconsin Acad. Sci., Arts & Lett. 26 337 The transparency as determined by the Secchi disc shows some correlation with the amount of organisms present in the water.

1931 Trans. Wisconsin Acad. Sci., Arts & Lett. 26 419 Transparency..is measured by the visibility of Secchi's disc.

1963 G. L. Pickard Descriptive Physical Oceanogr. iii. 23 The colour of sea-water can be judged most conveniently against the white Secchi disc..as it is lowered to determine the transparency of the water.

1975 New Yorker 12 May 80/3 They threw a secchi disc into the ocean to measure turbidity.

This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020).

单词	secchi
释义	Secchin. /ˈsɛki/ Forms: Also secchi. Etymology: < the name of Angelo Secchi (1818–78), Italian astronomer. Secchi('s) disc: a type of opaque white disc which is used in determining the transparency of water; the disc, maintained in a horizontal attitude, is allowed to sink and the depth at which it ceases to be visible from the surface is recorded. Secchi and Cialdi first described the use of discs of this kind in 1865 ( Compt. Rend. LXI. 101). ΘΚΠ the world > matter > light > transparency or translucence > [noun] > tool to determine transparency Secchi('s) disc1913 1913 Science 14 Nov. 703/1 The inland lakes of Wisconsin are not very transparent; the transparency, as shown by Secchi's disk, varying from less than 1 m. to about 7 m. 1931 Trans. Wisconsin Acad. Sci., Arts & Lett. 26 337 The transparency as determined by the Secchi disc shows some correlation with the amount of organisms present in the water. 1931 Trans. Wisconsin Acad. Sci., Arts & Lett. 26 419 Transparency..is measured by the visibility of Secchi's disc. 1963 G. L. Pickard Descriptive Physical Oceanogr. iii. 23 The colour of sea-water can be judged most conveniently against the white Secchi disc..as it is lowered to determine the transparency of the water. 1975 New Yorker 12 May 80/3 They threw a secchi disc into the ocean to measure turbidity. This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020). < n.1913
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