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Cathode Ray
Name: John
Status: N/A
Age: 50s
Location: N/A
Country: N/A
Date: 1999
Question:
I am a teacher of Advanced Chemistry and AP Chemistry for
sophmores in HS. I would really like to show them a demonstration of a
cathode ray, but our old CRT was from the '50s and my boss broke it. Can
I make one, and if not, where can I buy a small one?
Replies:
what about just an old oscilloscope? You usually think that they can be
controlled in the vertical direction -- this is how they are usually used.
But many of them have inputs that allow control of the movement of the
electron beam both in the horizontal and vertical directions. Many also have
control of what they call the Z axis, that is, the intensity of the beam.
Often this connection is on the rear of the scope. I have used scope's as TV
displays, tho they look sort of fuzzy. But at least you can see how the
voltage moves the beam of the electrons. You can also bring a magnet up to the
face of the scope, and see how it distort things -- you could of course do this
with any CRT, like your computer monitor, but it might mess things up so that
you would have to de-gauss later.
A crt itself is an electron gun (tube) in a decent vacuum, hitting a phosphor
screen. WHile all these pieces can be obtained, its not that easy, and it does
need some reasonable voltage (100's of volts) to make the gun go. Maybe this
would be a safety hazard unless you are careful.
S. Ross
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