Volume scattering functions for three general types of natural ocean waters have been obtained and are presented here. The three types of water are (1) deep clear oceanic water, (2) nearshore ocean water, and (3) very turbid harbor water. Also included are the results of laboratory experiments using sea water, filtered fresh water, and artificial scattering and absorbing agents. The beam transmission was obtained for all waters investigated. A brief description of the instruments used i s given. iii ABSTRACT 1. INTRODUCTION 2. DESCRIPTION OF THE INSTRUMENTS 2.1 Low Angle Scattering Meter 2.2 General Angle Scattering Meter 2.3 Transmissometer 3. CALCULATIONS

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A transmissometer developed at the Visibility Laboratory, University of California at San Diego is described. This instrument is capable of being operated by nontechnical persons with little instruction. No compromise has been made in the precision of measurement to obtain the design objectives which include ease of operation, low maintenance and reliability. The optical system, Which has a cylindrically limited beam rather than a collimated source of light, is discussed. 133 AN UNDERWATER TRANSMISSOMETER FOR OCEAN SURVEY WORK AbstractA transmissometer developed at the Visibility Laboratory, University of California at San Diego is described. This instrument is capable of being operated by nontechnical persons with little instruction. No compromise has been made in the precision of measurement to obtain the design objectives which include ease of operation, low maintenance and reliability. The optical system, which has a cylindrically limited beam rather than a collimated source of light, is discussed.