Hello again, I couldn't pass up the opportunity to add to the
discussion of un-flat music roll paper and words to describe it.

I first came across the word 'cockle' when I was working for Xerox.
Back then, our two major products were copiers and paper. It was
important that the paper moving through the copier on various paper
transports be flat. As you might expect, un-flat paper tended to
wander off course and find its way into inappropriate places in the
machine, causing the infamous paper jam.

Un-flatness came in three varieties: wrinkled, curled and cockled.
Wrinkled is fairly obvious -- it's a mechanical fold or crease in
the paper. Curled comes from uneven humidity between the edges or
surfaces, causing the edges to curl up or the sheet to not lay flat.
Cockled is the least common because it's caused by the sheet getting
wet. Then it dries unevenly because of various properties of the
fibers. The result is a 'bumpy' surface on the paper.

I always think of 'cockled' as a rather uncommon but interesting
word; it's even fun to say out loud because the word itself sounds
sort of 'cockled'.

Okay, you can go back to mechanical music now!

Regards,
Craig Smith
Upstate New York

 [ At https://wordhistories.net/2017/09/27/cockles-of-heart-origin/ 
 [ "This word is from Old French coquille, meaning shell ..."
 [ "The cockles of one's heart." -- Robbie