[ Jeff Taylor asked in 080317 MMDigest:
[> Were there any articles about the making of piano rolls
[> published in the 'teens and '20s?

In answer to how piano rolls were made, take a look at the following
on Mike Medding's pages:  http://www.doctorjazz.co.uk/youasked.html

This will show _one_ way such rolls were made.  There were also
hand punches and various other combinations.  Mike's pages are
a good start to finding such information.

Alan Wallace