Abstract: A method and apparatus allows mutual comparison of a mode of appearance of a color by the visual sense with a mode of appearance of the color from a calorimetric value from a calorimeters, and establishes a corresponding relationship between both evaluations. In the illumination variable calorimetric method and colorimeter, an illumination adjustment mechanism and an illumination measurement light receiver are disposed in a measurement optical path of an optical portion. After an illumination is adjusted to a predetermined illumination while a standard plate is placed on the surface of a sample table, standard adjustment is effected. Thereafter, measurement is started by placing a sample on the sample table, and the illumination of the sample table is varied by the light quantity adjustment mechanism so that changes in hue, saturation and lightness of a surface color of the sample and each color difference value with respect to the change of illumination of the same sample can be measured and displayed.

Abstract: A method of determining the color difference between two similar colors including the steps of determining the tristimulus values for a reference color with which another color is to be compared, providing a planar chromaticity diagram for the values other than brightness in which the values for the reference colors are at the origin and the abscissa and ordinates of the diagram, determining the hue of the reference color and plotting in said diagram an equi-hue line, determining the tristimulus values for the other color to be compared to the reference color and plotting the values other than brightness on the diagram, plotting an equi-saturation line on the diagram perpendicular to the equi-hue line and extending through the origin, plotting lines parallel to the equi-hue and equi-saturation lines through the position of the plotted values for the other color and extending across the equi-hue and equi-saturation lines, so that the difference in the tristimulus values for the other color from the reference c

Abstract: A cycle time/temperature controller for a combination corrosion tester includes a device for setting a loop number and a number of repetitions of that loop, a device for setting a sequence of test items within a loop including: a test temperature, a test humidity, and an operating time; the controller also includes a generator for generating an operative signal and a device for enabling the start of operation according to an external start signal and an output circuit for outputting a contact output corresponding to each test item for the set operating time; adjustment outputs for dry bulb and wet bulb temperatures are also provided, each output providing adjustments at the set test temperature and the set test humidity. The controller displays the current loop number and the number of repetitions and also displays: the test item number, the dry bulb temperature, the wet bulb temperature, the wet bulb temperature or humidity, and the time elapsed, during its operation.