A Photoelectric Nephelometer for Estimating the Population Density of Microörganisms

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Abstract
2 forms of an inexpensive apparatus are described, to estimate rapidly the density of populations of microorganisms in fluid media with greater precision than by the more common counting methods. The amount of light absorbed as it passes through the suspension is measured with a photoelectric cell and a microammeter. The equipment is readily calibrated for the organism used, and the method gives a useful measure of growth of a population, including both number of organisms and size of cells.

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