(from the article `microscope`) In this instrument a wire with a sharpened tip is mounted in a cathode-ray tube. Electrons are drawn from the tip by a high electrical field and ...
<instrument, microscopy> Either one of two kinds of point-projection microscopes, both invented by E. W. Muller: (1) The older device (1936) is a specialised cathode-ray tube, employing field-emission of electrons from a negatively charged tip of a very sharp needle in a vacuum, by point-projection of the image onto a positively charged, fluo...
[n] - electron microscope used to observe the surface structure of a solid
noun electron microscope used to observe the surface structure of a solid
a device in which electrons liberated by field emission are accelerated toward a fluorescent screen to form a magnified image of the emitting surface. Cf. field-ion microscope.