The surface of a kidney stone. (THAT'S gotta hurt!) |
– 1940
What's
10 feet high and weighs half a ton – but was used with the most
delicate, tiny organisms ever?
The
first American electron microscope!
Dr.
Vladimir Zworykin, the Russian-American inventor who gets much of the
credit for inventing television, built America's first electron
microscope, and he demonstrated it for the first time on this date in
1940. The huge microscope produced magnification of 100,000 times.
The electron microscope was first conceived of—and
patented—by Hungarian physicist Leo Szilard, and the first to be
built was created by two Germans, Max Knoll and Ernst Ruska, in 1931. (You may know that 1931 was not a good year to be German—the
worldwide stock market crash had hit Germany particularly hard, and
Adolph Hitler and the Nazi party were seizing control of the country
at that time!)
Snowflake |
Ordinary
microscopes use visible light and glass lenses to create magnified
images of things, whereas an electron microscope uses a beam of
electrons and electrostatic or electromagnetic “lenses” instead.
We can get much more magnification and image resolution because
electrons have wavelengths that are about 100,000 times shorter than
the wavelengths of visible light. These days a good electron
microscope can show magnifications up to 10,000,000x—and an
ordinary microscope only reaches magnifications of 2,000x.
Wow!
What a difference!
Enjoy
Electron Microscopic Images!
Check
out the up-close (way up-close!) images of scorpions, spiders and sharks on Wired Science.
The eye of a fly |
Pollen |
Here
are some images as varied as a wounded blood vessel, salt and pepper,
and eyelash hairs.
There
are more and more beautiful and horrifying and interesting electron
microscopic images here and here and here and here. There's some repetition within these links—but every website has some
unique images, too—and they are all pretty amazing!
A mite-- yikes! |
If
you haven't already, check out the Virtual Electron Microscope.
Also
on this date:
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