Abstract
Methods for shortening the work required to obtain blackening curve separations at a low constant density are discussed. By employing Seidel densities, blackening curves are obtained sufficiently straight for accurate separations to be derived by plotting two points on each curve and joining these points by a straight line, thus reducing the number of microphotometer readings required and eliminating curve fitting. A simple method of plotting Seidel densities directly from galvanometer readings by means of a suitably graduated scale is described and this, in conjunction with a special scale for measuring line to background separations, shortens the method and renders the use of mathematical tables unnecessary, even when background correction is required.
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