Record Display for the EPA National Library Catalog

RECORD NUMBER: 5 OF 5

OLS Field Name OLS Field Data
Main Title The meaningful use of the Secchi disc /
Author Williams, Jerome.
Publisher Chesapeake Bay Institute, Johns Hopkins University,
Year Published 1968
OCLC Number 13440211
Subjects Seawater--Optical properties. ; Oceanographic instruments.
Holdings
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Status
EJDD  CBI-JHU TR 45 OASQA Library/Fort Meade,MD 03/14/1997
Collation 13 pages : illustrations ; 28 cm.
Notes
Includes bibliographical references (page 13).
Contents Notes
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.