There are slides devoted to this topic: Lecture 3, pp. 34-41.
For a quick overview of the Scheutzes’ significance in the history of computing, and specifically in their relation to Babbage’s work, visit the Georg and Edvard Scheutz page on the Computer History Museum website.
For another brief introduction to the Scheutzes and their machine, read this timeline entry from the History of Information‘s chronological look at information technology.
Go to “The differential engine of Pehr-Georg and Edvard Scheutz” article, on the History of Computers site, to read a more detailed history of how the Scheutzes learned of the Difference Engine, developed their own, and tried to market their machine. The article also discusses the inner workings of the machine.
“George Scheutz and the First Printing Calculator” is an well-researched article written for the Smithsonian Press. The lengthy piece discusses the lives of the machine’s creators and publicists; the transmission of ideas and machines between Babbage, the Scheutzes, and other inventors of the time (including some in America); and the historical and scientific significance of the engine. It includes an expanded appendix.
Read “Georg Scheutz and the First Printing Calculator,” by Uta Merzbach