The consumer-oriented magazine Popular Science has made its entire 137-year archive available for free online: Search the Popular Science Archive: (http://www.popsci.com/archives). Here is a short explanation for their site:
We’ve partnered with Google to offer our entire 137-year archive for free browsing. Each issue appears just as it did at its original time of publication, complete with period advertisements. It’s an amazing resource that beautifully encapsulates our ongoing fascination with the future, and science and technology’s incredible potential to improve our lives. We hope you enjoy it as much as we do.