|Online tool for searching the back issues -- Click to enlarge|
Popular Science worked with Google to create the archive. The Archive Explorer (pictured above) allows you to either browse the covers or enter a search term to see how many times it appeared in an issue. The image above used 'Radio' as its search term, and you can it started being written about in 1916 and quickly became a favorite topic.
The issues are fully digitized. You can go any one and read all of its articles, as well as look at all of the old ads and whatnot. I've collected some samples of old Popular Science illustrated covers. There are more after the jump, and of course many more at the archive itself.