the name for the instrument that measures the difference threshold, that is just a noticeable difference, for visual linear distances. This was defined by Francis Galton, 1822 to 1911,who was a British scientist.
the name for the instrument that measures the difference threshold, that is just a noticeable difference, for visual linear distances. This was defined by Francis Galton, 1822 to 1911,who was a British scientist.