Early commercial light scattering equipment

Most of the equipment described in the preceding section has been individually designed but commercial equipment was also developed. 

The Sinclair-Phoenix aerosol photometer brought the light to a focus at the sample cell, with a diaphragm stop placed in the optical path so that a diverging cone of darkness encompassed the light-collecting lens of the 

The Brice-Phoenix light scattering photometer and the Absolute light scattering photometer were designed for the measurement of attenuation, dissymetry and depolarization. The former has also been used to determine the particle size distribution of an aerosol at various levels in a flowstream through a column [125]. 

The Brice-Phoenix model 7 photo-nephelometer received light at two photocells at right angles to the incident beam whilst the model 9 had a third photocell to measure the transmitted light. 

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