Here is a video of a 'mini' Pot Devin Labeler glue machine in action.
I picked this up from Paul Frank at Perfection Type. These machines originally were made for applying labels for mailing, But the modern letterpress resurgence has given these little beauties a new and creative life.
I'm gluing 2 sheets of 80# cover, 2 sheets of 100# cover & 2 of chipboard .26pt. It can run 20 pound paper with no problem. Really an amazing range of paper weights.
It is a wonderful machine for small in-shop projects and to take on the road for traveling workshops & classroom situations.