Assertion: reed | /r/AtLocation | longitudinal grooves
Facets:
value: round the circumference of the barrel
type: LOCATION
Source sentences:
text: The reeds were double " hautbois " reeds all set in a wooden stock or box within the bag; by means of regulators or slides, called layettes, moving up and down in longitudinal grooves round the circumference of the barrel, the length of the drone pipes could be so regulated that a simple harmonic bass, consisting mainly of the com.mon chord, could be obtained.