Craft · 6 pages · 12 min
Why a piano drifts with the season
Wood in the soundboard swells and shrinks with humidity, and that movement changes the tension of the strings.
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From the opening
A piano goes out of tune through the year because its wooden soundboard takes on moisture and gives it off. The board's crown rises or falls, the bridge pressure on the strings changes, and the pitch of the whole instrument moves. The opening covers humidity swells the soundboard, crown changes string tension, and dry heat lets pitch drop.
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Inside
- Humidity swells the soundboard
- Crown changes string tension
- Dry heat lets pitch drop
- A broad shift is weather
- Where the idea stops applying
- A distinction worth keeping
Sources
- Soundboard crown and downbearing
- Humidity and piano pitch