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A description is given of the design and construction of two instruments for studying atmospheric optics. One device, the Recording Polar Nephelometer, measures the volume scattering index of light passing through a sample of natural atmosphere, with scattering angle, polarization, and wavelength as variables. A new calibration procedure has been developed which employs a diffusing screen of known reflectance and transmittance as the standard. The second device, the Portable Transmissometer, measures the extinction coefficient with an accuracy of 5% under all conditions. These instruments are transported by a specially-equipped station wagon to form a mobile research unit. Samples of results obtained in fog and clear air are included.
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Pritchard et al. (1960) studied this question.
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