Why aluminum works and why steel works better
Anything will work as a magnetic "shield" if it helps to put distance between the magnet and the thing being protected. The aluminum only works because to some degree it provides extra distance for the field to travel before hitting the picture tube.
Steel actually works as a shield since it actually diverts the magnetic flux "lines" that would normally reach the tube through itself instead. And this is in addition to the extra space it puts between the magnet at the tube.
If you use aluminum, you are only relying on the distance. Field strength is usually calculated as related to the square of the distance, so double the distance, 1/4 the field strength.
IOW, use the steel. Thicker is better. The higher the iron content, the better.
ensen.
Anything will work as a magnetic "shield" if it helps to put distance between the magnet and the thing being protected. The aluminum only works because to some degree it provides extra distance for the field to travel before hitting the picture tube.
Steel actually works as a shield since it actually diverts the magnetic flux "lines" that would normally reach the tube through itself instead. And this is in addition to the extra space it puts between the magnet at the tube.
If you use aluminum, you are only relying on the distance. Field strength is usually calculated as related to the square of the distance, so double the distance, 1/4 the field strength.
IOW, use the steel. Thicker is better. The higher the iron content, the better.
ensen.- Status
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