Abstract
The visual ranges of dyed and transparent twines and also of knots of the net were measured succesively in tank water, illuminated by diffused light from flourescent lamps for varying the physical conditions, namely, colour and reflectance of an object, turbidity of water and brightness which might have direct effects upon underwater visibility. The measurements of the visual range were made through three light filters; blue, green and orange. The visual rangs of the yellow twine was the largest under less turbid conditions but decreased remarkably with the increase of turbidity. Transparent twines were less visible than dyed opaque twines. The visual range was longer than that of twine for knots in brighter surface irradiance but both values become almost the same with the increase of burbidity. The slopes of the curves of the visual range of niyed twines plotted against the wave-length of maximum transmittance of three light filters provided a means to classify them into two types. Twines belonging to the first type are more visible under long wave-legths, such as, yellow, green, and blue twines and those of the other type are most visible in the wave-length, 530 mμ, such as, red, violet, brown, kacchi and grey twines.
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