In this paper, a potentiometric device is newly developed to measure the threedimensional handwriting motion. By use of this measuring system, it is possible to measure and record the three-dimensional handwriting motion path and its distance, the duration of each pen stroke, the velocity of the tip of the pen, the handwriting pressure and its integrated pressure. 20 right-handed male and female students aged 19 to 23yr, and 47 handicapped persons aged 52 to 76yr served as subjects. From the results, it was suggested that there were remarkable individual differences in the handwriting pressure for the aged handicapped persons. Furthermore, the pattern of the handwriting pressure can be seen as a index of estimating the acqusition of skill for the aged handicapped persons.

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This paper is concerned with the following important factors that determine character legibility on CRT displays. (1) Appropriate contrast level expressed as a function of background luminance. (2) Permissible luminance of disturbing reflections of luminares on CRT screens. (3) Effectiveness of filters for CRT displays. Character legibility on CRT display is affected by the photometric characteristics of CRT and by the lighting conditions of the workplace. For each factor considered, the recommended range of values is determined on the basis of experimental evidence and field survey on lighting conditions.

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