He used the method of scratching into a copper sheet. It is called Intaglio. Intaglio is a technique in printmaking. Copper and zinc are the two materials that are normally used with this kind of medium. Another example of this are collagraphs.
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Answer:
An overtone is any frequency greater than the fundamental frequency of a sound. Harmonics, or more precisely, harmonic partials, are partials whose frequencies are numerical integer multiples of the fundamental
C) 8 pitches in an octave
