In his introduction dated 1827 Babbage indicated that the book was printed on the presses of Augustus Applegath; in the footnote Babbage referenced the recent acquisition by William Clowes of Applegath's premises and printing machines that appears to have occurred between the time of printing the tables and the time of printing the introduction. As a technologist it is likely that Babbage would have sought out Applegath in order to have his book printed on the latest printing machine. The third edition of Babbage's book photographed here was published by Charles Knight, a great exponent of machine printing, and one of Clowes's major customers.