In studying the Aeolian Pipe Organ Roll (116-note), I need the exact
parameters used in  that rolls' production.  I need the exact punch size
and the step advance distance.

My own measurements yield a punch diameter of .043 inches with a step rate
of 28 steps per inch, 336 steps per foot.

If anyone has measured these rolls, or knows from any source, that my
measurements are wrong, I would like to know.

Bob Taylor