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0.73 to approximately after-images following after-images of white aperture apparent light surface approximately log arithmetically the duration average duration Average Number Berry and Henry bulb cabinet calibrated candles per sq Closed Reserve COLORS By William Cornell University dark chamber data from Experiment direct relation divergence Duration Interval Duration Eastman Kodak exponential trend flight of colors flight varies geometrically Henry Imus i.e. log I.T. Product Fig I.T. product increases I.T. product varies increases geometrically Interval Duration Interval kymograph Level ml LIBRARY The Gift light proof log I.T. product log product millilamberts milliseconds NORTHWESTERN UNIVERSITY LIBRARY number of observations number of phases O's eyes periments phenomena phenomenal changes points of O's product increases arithmetically product varies arithmetically quantitative aspects record shutter Six Os served stimulus exposed stimulus light straight line relation TABLE II Showing tambour thin frosted glass University of Rochester visual field Wedges white light William Berry Yale University