The horizontal engraved lines found on some early musical box cylinders. The lines were said to be used to aid in timing the music in the absence of a rotary dividing engine. Mostly used by Francois Nicole.

See chimney flute pipe.

See automatic

Music roll mechanism comprising the tracker bar, takeup spool, mechanisms for shifting from play to rewind, pinch rollers or hold-down roller, tracking mechanism, etc.

1. Perforated paper roll as used on a player piano, orchestrion, organ, etc. Can be of the endless or rewind type. 2. Sustained or reiterating striking action, particular on a drum (as in snare drum roll).