Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

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The residual gases in a vacuum tube are dense by comparison.

But how can a magnet increase the sensitivity of a vacuum tube?

This is the reason the vacuum tube amplifies as well as detects.

Don't fail to keep the leads to the vacuum tube as short as possible.

It is also identical with the cathode ray of the vacuum tube.

Fluorescence is most efficiently excited by the cathode rays of a vacuum tube.

The terms usually apply to conductors leading the current through a liquid or gas, as an electrolytic cell, or vacuum tube.

The electric spark, the arc, the electric discharge in a vacuum tube, and the flame are the means usually employed.

The apparatus used for the purpose consists of a vacuum tube mounted in the usual way upon a horizontal axis capable of rotation.

So engrossed were the boys in the problem of the magnet and vacuum tube that they forgot all about Herb and his experiments.