You can search for some magazines through Google Book Search new, of note… Popular Science, Popular Mechanics & Bulletin of the Atomic Scientists. All of the magazines also have a map at the bottom so you can see where things were and/or mentioned, oh and some ads from Google – they are likely doing some type of revenue share with the publishers in that program. More info @ the Google blog.
Popular Science. Looks like they have 1890 to almost present.
Popular Mechanics. Looks like they have 1900 to almost present.