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IT IS A LIGHT BULB WITH AN EXTRA WIRE IN IT.

A filament that can be heated. A metal plate that is not. The air pumped out. Current passes
through it in one direction and will not pass in the other, and that single property is the
foundation of everything electronic that exists.

Not because the reverse current is small. Because there is no reverse current at all.
The cathode is hot and can emit electrons. The anode is cold and cannot. Reverse the voltage and
you are not asking a poor conductor to conduct, you are asking a mechanism that does not exist to
operate. The book computes the number: a forward to reverse ratio of roughly ten to the sixty
fifth, corresponding to a wait of about ten to the thirty second times the age of the universe
for one single electron to cross the wrong way.

This matters because Maxwell's field cannot do it. Field theory is linear, and a linear system
cannot treat one half of a wave differently from the other. Which means a world described by
fields alone has radio waves in it and no possible way to listen to one.

Fleming had studied the effect for twenty years before anyone needed it, showed it rectified in
1890, and then did nothing with it for fourteen years because there was nothing to rectify. When
Marconi's receiving problem finally arrived, the step took no time at all.

Fleming Decompressed is about what happened to the idea afterwards, when circuit theory reduced
an interface to a symbol, and about the same shape reappearing in devices that share none of its
physics.

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