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Blasts from the past

Optical

microscope

The most widely used type of microscope. It uses light to magnify an object up to about 1,500 times.

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WEIRD

• OR WHAT?

On September 28, 1989, Don Eigler became the first person to move and control an individual atom. He used a scanning tunneling microscope to move 35 xenon atoms to spell the name of the company he worked for—IBM.

Electron

microscope

This microscope uses an electron beam instead of light to form images. Magnifies up to two million times.

Scanning probe microscope

Capable of producing images of individual atoms, this microscope can magnify up to 100 million times.

Binocular

microscope

This features two eyepieces instead of just one, so the user doesn’t have to close one eye to view.

Stereo microscope

A binocular microscope with two objective lenses as well as two eyepieces to generate a 3-D view.

Tell me morę: electron microscope

■    Electron microscopes use a beam of electrons to create images.

■    Electrons can’t go through glass lenses, so electron microscopes use magnetic lenses.

■    Air is sucked out of the microscope to stop it getting in the way of the electrons.

■    Electrons bounce off the specimen or go through it and then make an image on a screen.

■    An electron microscope can make images of objects 500,000 times smaller than the human eye can see.

■    Electron microscopes madę it possible to see viruses for the first time.

New microscopes

New types of microscopes are still being invented. At the California Institute of Technology in 2008, Changhuei Yang invented a new optical microscope that doesn’t need lenses. The pocket-sized instrument uses the same type of light-sensitive chip that is found in digital cameras.

Operating

microscope

Another binocular microscope used by surgeons to carry out intricate operations on tiny areas of the body.

Digital microscope

This high-tech microscope is capable of sending digital images to a Computer.

RECORD BREAKER

The world’s most powerful microscope is called TEAM 0.5. TEAM stands for Transmission Electron Aberration-corrected Microscope. Located at the Lawrence Berkeley National Laboratory, California, it can see objects as smali as half the width of a hydrogen atom.

Microscopes |184|185

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