Abstract: The first part of a work measuring the normal threshold of hearing is reported. Usable results were obtained from 1843 young people 16—25 years of age. Common electromagnetic earphones were used. The calibration was done on a Brul and Kjaer artificial ear. During the test, subjects were seated in a sound-proof chamber.An "equivalent ctirve" is plotted from the overall anthmetic means for different frequencies. On calculating the means sepatately for the male and female sexes andfor the right and left earss, no significant differences are found.

Key words: NULL