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This depends on the number of vibrations of one tone, predominant in intensity over the others, called the fundamental or ground tone, or first partial tone.

Compare what Helmholtz says regarding the repetition and coincidence of partial tones.

The brilliant sonorousness and roundness of the timbre of the horn are due to the strength and predominance of the partial tones up to the 7th or 8th.

The higher sounds that accompany the fundamental are called sometimes harmonics, sometimes upper partial tones, but generally overtones.

High sounds cannot obliterate low ones, but, on the contrary, the sensation of each partial tone of which compound musical sounds is formed is diminished by all the tones below it in pitch.