More PDFs (and sometimes epubs) of original Victorian and Edwardian books of interest to Steampunks. See part one here, and how these books were found here.
Automata (1893)
http://www.archive.org/details/automataoldandn00unkngoog
Automobiles (1900)
http://www.archive.org/details/horselessvehicle00hiscrich
Babbage On The Difference Engine (1864)
http://books.google.com/books?id=Fa1JAAAAMAAJ
Engineering (1860)
http://books.google.com/books?id=rkkOAAAAYAAJ
Factories (1844)
http://books.google.com/books?id=dXs4AAAAMAAJ
The Jacquard Loom (1895)
http://www.archive.org/details/jacquardweaving00bellgoog
Lovelace On The Difference Engine (1853)
http://www.archive.org/details/scientificmemoir03memo
(also http://www.fourmilab.ch/babbage/sketch.html)
Mechanisms (1868)
http://books.google.com/books?id=vOhIAAAAMAAJ
Shipbuilding (1869)