Stopped organ pipes sound the same pitch at half the length

Evidence

Although the pitch of these stops is equivalent, and they are therefore both labeled 8′, the stopped gedackt pipe is half the length of the open principal pipe. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1185

Categorization

• CANDY: A neat fact about organ building worth sharing — that a closed pipe needs only half the length of an open one for the same pitch, which is why gedackt stops pack into small spaces.
• XREF: connects to: Open and stopped organ pipes correspond to open-open and open-closed acoustic tubes. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1181