Drilling through a magnet?

[ebarker]

1st - what is your definition of "old radio" ?

I am curious about the 'old' definition especially for us 'old' radio types like Don and Al and myself.

2nd - a comment. There is potentially a LOT to be learned by your exercise. First of all the history of magenetic devices in radio speakers. And secondly a lot about properties of materials.

A lot of people don't know it but there are engineering degrees in Material Science Engineering. Those folks spend all their time on making sure engineers have access to "the right stuff".

I think I saw on 60 minutes or somewhere that in some countries in Europe a part of engineering education involves spending time in a lab with a variety of different metals and substances. Basically they file and file and file and cut and cut and drill and drill and cut and file and file. All by hand. It helps the student really get a hands on feel for material properties.