"library typo of the day" - calender
except that is a correct spelling in papermaking
calender: n. - A machine that smoothes or glazes paper or cloth by pressing it between plates or passing it through rollers v. - Press between rollers or plates so as to smooth, glaze, or thin into sheets.
I added a comment first thing this morning, but it has not been posted yet. Hopefully no one went in and changed all the paper or cloth related calendering references to calendaring.
an addition at 2:30 -- I am now an astute reader :)
Not really, I just work in a library where we have materials on calendering of paper.