Neostyle & A Paper Matrix

The gang at New Leaf Editions recently alerted us that a place in town has put one of these up for sale. A Rotary Neostyle No. 8-F. What exactly is it, we all wondered. The answer was found at the excellent site of the Early Office Museum, on a page that offers concise descriptions of many early printing and reproduction machines and methods. (How many people know that their "book press" really is a copy press?) For example, picking one purely at random, here's the stylish Minolta 1114:

A more thorough explanation of the Neostyle's operation was found in this 1999 response on a Yahoo group to a query about the machine.