Primary Source Image from Image Quest
Dawson's improved perfecting machine. Image taken from A practical treatise upon modern Printing Machinery and Letterpress Printing Illustrated, etc. Originally published/produced in Cassell and Co.: London, 1888. A practical treatise upon modern Printing Machiner. Cassell and Co.: London, 1888. 11899.h.31, 167. 11899.h.31 page 167
Printing press. Fine Art. Encyclopædia Britannica ImageQuest. Web. 4 Sep 2015.
http://quest.eb.com/search/163_2977027/1/163_2977027/cite