A Linear Optical Density Potentiometer for Use in Photoelectric Spectrophotometry

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Abstract
Summary: A description is given of a linear optical density potentiometer, interchangeable with the logarithmic density potentiometer incorporated in the Unicam SP500 and Beckman DU photoelectric spectrophotometers. The potentiometer covers the density range 0·0 to 2·0; each of the approximately equal subdivisions of the scale throughout this range represents a density increment of 0·001. The arrangement of the controls is such that, on the completion of the measurement, the density of the solution under investigation is indicated by the appearance of a horizontal row of figures, visible through an aperture in the panel.

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