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<p>A light transmission technique was used to measure the mean size of a group of graphite particles suspended in water and the particle sizes in an aerosol of ammonium chloride in air. Passage of a single red laser beam through a known concentration of graphite particles in water made it possible to obtain a measure of their mean size. Laser beams of two different wavelengths were used for the measurement of a suspension of unknown particle size and concentration.
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<br>Subjects:</div>
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Phelps, Jean Price</div>
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