Madame Patel and Chardon, a moment later, were walking slowly down the broad avenue of trees through which drawled the bourdon of the breeze this night in early May.
"Melomaniacs"
James Huneker
The proper name of it is the rote, so called from the internal wheel or cylinder, turned by a winch, which caused the bourdon, whilst the performer stopped the notes on the strings with his fingers.
"Account of a Tour in Normandy, Vol. II. (of 2)"
Dawson Turner
bourdon had opened it to the steam source.
"The Introduction of Self-Registering Meteorological Instruments"
Robert P. Multhauf