Bulk Tape Eraser

From: Carlos Murillo <carlos_murillo_at_epm.net.co>
Date: Tue Jun 18 22:23:10 2002

At 11:26 PM 6/18/02 +0100, you wrote:
>> Wouldn't switching it on and off be many times more
>> efficient at producing a time-varying field? :-) .
>
>Isn't that one reason that those erasers run on AC?
>
>-tony

It shows that I haven't been near one of them. But I did
repair the "eraser" for magnetic strips embedded in the
spine of all books at one of the Cornell University libraries,
where I worked for a while. Method: charge a few big caps
to about 340V, then discharge suddenly through a big coil.

Dangerous.

carlos.

--------------------------------------------------------------
Carlos E. Murillo-Sanchez carlos_murillo_at_nospammers.ieee.org
Received on Tue Jun 18 2002 - 22:23:10 BST