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The meaningful use of the Secchi disc

Author: Jerome Williams; Chesapeake Bay Institute.
Publisher: [Annapolis] : Chesapeake Bay Institute, Johns Hopkins University, 1968.
Series: Technical report (Chesapeake Bay Institute), 45.; Reference (Chesapeake Bay Institute), 68-15.
Edition/Format:   Print book : EnglishView all editions and formats
Summary:
The Secchi Disc is examined in terms of a target seen by the human eye under threshold contrast conditions. Results indicate that the Secchi Disc Reading is related to both the extinction coefficient and the beam transmittance coefficient. There appears to be no way to separate the two from the use of the Secchi Disc alone. In addition, if these readings are to have any meaning at all it is strongly indicated that  Read more...
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Details

Document Type: Book
All Authors / Contributors: Jerome Williams; Chesapeake Bay Institute.
OCLC Number: 13440211
Description: 13 pages : illustrations ; 28 cm.
Series Title: Technical report (Chesapeake Bay Institute), 45.; Reference (Chesapeake Bay Institute), 68-15.
Responsibility: by Jerome Williams.

Abstract:

The Secchi Disc is examined in terms of a target seen by the human eye under threshold contrast conditions. Results indicate that the Secchi Disc Reading is related to both the extinction coefficient and the beam transmittance coefficient. There appears to be no way to separate the two from the use of the Secchi Disc alone. In addition, if these readings are to have any meaning at all it is strongly indicated that an optical filter be placed in the system when readings are taken. Special colored glasses are suggested for this purpose.

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