published on: 2013-12-04 14:18:27
engineeringhistory: William Coolidge holding an X-ray tube,
approvedgearnstuff: Love vintage ads - not to mention knife
cid25.tumblr.com/post/68976916997/
cid25.tumblr.com/post/68977190222/
highgatedreams: By Sakessu on Flickr
seahorsecarousel: Inky Octopus for a friend! Prints available