You really are missing a lot if you don’t read Boing Boing. Today, they just made my refrigerator research much easier by informing me that the entire archives of the magazine Popular Science are now online thanks to Google Books. That’s 137 years worth of issues, including the post-1923 copyrighted stuff. What makes this particularly useful is that currently you can hardly get anything from Scientific American online, even the pre-1923 stuff is blocked on Google Books.
At the moment, all you can do on their site is browse by keyword. However, following the advice of the commentators there, I started browsing by issue straight from Google Books and found refrigerators galore, like the one above.