The significance of the geometry of the optical system in extinction measurements for a liquid dispersion is emphasized. In particular, the mechanism by which light is lost by scattering in a transparency-meter in the sea is discussed. The strongly selective absorption of yellow substance is demonstrated. A new transparency-meter sufficiently accurate for measurements in clear ocean water is described. A long optical path in the meter is attained by multiple reflection between three concave mirrors of equal curvature. The depth is recorded by means of a new device.
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N. G. Jerlov (1957) studied this question.
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