For those interested in these kind of mechanical things, Dover has republished some 19th and early 20th century public domain books that collected together mechanical movements. Some examples:
There is also a website that has all the illustrations and text from the Brown book, and has added animated versions of many of them: http://507movements.com/about.html
Since both of these are in the public domain, you can legally print your own copy, which is more convenient for some people.
Google Books has scanned the 507 Mechanical Movements book, although their search engine is terrible at finding things like that on their own site; one copy is available from http://www.pdnotebook.com/wp-content/themes/thesis_16/custom.... The other, longer book is harder to find via HTTP, although Libgen has a scan of the 2007 reprint. Timothy Schmidt scanned the original 1899 edition in 2008 and uploaded it to The Pirate Bay, which seems to not have it now: http://builders.reprap.org/2008/12/1800-mechanical-movements....
US patents are also a wonderful source of public-domain diagrams of machinery, and they are generally better explained (especially before about the 1980s, at which point their writing quality took a nosedive and they descended into nearly-unreadable jargon) but I'm not aware of an easily downloadable repository of scanned patents.
Just found it using Google. I think I had to end up quoting various parts of the title, adding "PDF" as part of the search, and going past the first couple of pages of search results.
"507 Mechanical Movements: Mechanisms and Devices" by Henry T. Brown, from 1868: http://www.amazon.com/507-Mechanical-Movements-Mechanisms-De...
"1800 Mechanical Movements, Devices and Appliances" by Gardner D. Hiscox, first published in 1899. This is the 16th edition from 1921: http://www.amazon.com/Mechanical-Movements-Devices-Appliance...
There is also a website that has all the illustrations and text from the Brown book, and has added animated versions of many of them: http://507movements.com/about.html