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  진지도 측정에 piano wire(피아노선이 많이 사용되며 piano wire에 대하여 간단히 소개하면 다음과 같다.
piano wire(피아노선)이라는 명칭은 원래 피아노 현용으로 강도, 인성 등의 기계적 성질과 물리적 성질이
우수 한 0.8% C 의 고탄소강선이 사용되어진 것에서 유래된 것이다.
Piano wire is a specialized type of wire made for use in piano and other musical instrument
strings, as well as many other purposes. It is made from tempered high-carbon steel, also known as
"spring steel".
General purpose high-carbon steel drawn music wire is manufactured in both inch and metric gauges
in diameters as small as 0.006 inch up to 0.192 inch (0.15 to 4.8 mm).
A small number of companies produce the tough, high tensile strength polished wire intended for limited
music instrument markets, which is manufactured from steel of a specific composition by cold drawing.
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