A Method of Measuring Surface Water-Colour

概要

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For either the measurement of colour of shallow water through which bottom substance is seen, or that of the surface layer of water only, ordinary Forel's method is not available. To avoid this inconvenience, an instrument, shown in Fig. 1, is deviced, which is based on the fact that when we put the water to be examined between two plane mirrors faced and parallel to each other, and transmit the rays of the sun from a slit (A) and reflect re-peatedly till reach another slit (B), causing the same effect as the rays pass through deep layer of water to make out water-colour on account of absorption and dispersion of molecules of water or suspending particles. (see Fig. 2). The length of penetration (ln) is given by ln=2nd/cosθ, where, n denotes the number of refle-ction, d the distance of two mirrors, and θ the angle of incidence respcctively. Linear correlations have been founded to exist between the colours observed by ordinary method (C) and those of the present method (C') as shown in Fig. 3.
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