Among the many little-known-yet-completely-awesome things that Google has done over the years is their partnering with Popular Science magazine to make the publication's complete 137-year archive available online for free. And to help provide would-be PopSci archeologists with a starting point, they've grouped similar articles into a collection of fascinating "Archive Galleries."
I've only scratched the surface of those archives, but wanted to draw your attention to the Vintage Robots Archive Gallery, which features pictures of 21 groundbreaking, important, and strange robots from the past. Each picture contains a short write-up and then a link to the entire article. For example, you can read the April 1933 article associated with the terrifying mantis/horse monstrosity shown above by clicking here.
Really great stuff. I can't wait to keep digging through these archives.