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300 subject group appear average cartography characteristics Colorimetry comparison cones curves darker densitometer dot area symbols dot patterns dot sise dot size dot spacing tests eaoh effect eye movements Figure 30 Footnote frequency graphs gray value guesses halftone horizontal Ibid intersection Isopleths Kurt Koffka legend area light lines per inch measured nystagmus OAaosqo Ocular Tremor osoq particular gray tone PATTERN-VALUE TESTS patterns oriented perceived percent area inked perception pxnoA qoxq receptors reflectance density responses retina s^oofqns s^op square arrangement stimulus terns test booklets test maps test subjects TEXTURE TESTS textured patterns threshold vertical Visual Acuity visual lines visual pattern visual perception white dots