This was the first Chinese translation of Western mechanical knowledge and machines. Terrenz interpreted western texts in spoken Chinese. Wang illustrated Terrenz’ interpretations and formulated them in written Chinese. An English translation of the book title is 'Diagrams and Explanations of Wonderful Machines'. Joseph Needham has made brief notes on some of the files, describing their content. See also SCC2/162/1 for a general list of material left by Fritz Jäger, relating to Chinese history of science.