At some point in the last few decades, someone took a poster and stuffed it in an unused office at Lawrence Livermore National Labs (LLNL). The poster was made by the W.M Welch Scientific Company in 1944, and it depicts in excruciatingly awesome detail how electromagnetic waves work.
When it was uncovered a while back, the folks at Livermore Labs decided to hang it in the hallway, rather than hide it away for a few more decades, which was a good call. The LLNL Flickr account now has a super-high resolution scan of the poster all 10,000 x 6958 pixels of it. If you want to check it out at full resolution, its a 107MB jpeg file. Yeah, its going to take a little while to load.
Up at the top is the electromagnetic spectrum diagram from all those science textbooks, but here its highly detailed and has sketches of examples of each kind of radiation above it. Below the main spectrum diagram the poster goes into the specifics on a number of topics. This is basically an infographic before anyone knew what an infographic was.
Each section of the spectrum corresponds to a color-coded section in the bottom area. You can learn all about the properties, uses, and effects of each type of electromagnetic wave. It covers everything from simple diffraction to the effects of cosmic rays.
This is a beautifully illustrated poster done in that 1940-50s style that youve probably seen emulated popular video games, such as Portal and BioShock. Now its retro, but back then its just how these things looked. Its obviously way too big to show you here, so head over to the LLNL Flickr page and zoom way in.
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