Re: HiFi equipment

glen herrmannsfeldt wrote:
clay@xxxxxxxxxxxxxxx wrote:

Years ago, when people were getting into all of the "magnet stuff",
I.e., like sleeping on a bed of magnets to cure back problems or
putting a magnet by the fuel line in your car to improve mileage. We
put the ads up on the bulletin board outside of the physics office and
asked students to identify as many violations of physics that they
could find. For example, magnetizing a liquid.

Since the subject is HiFi, some years ago magnetic liquids
became popular to help cool speaker voice coils. (I presume
suspended magnetic particles in a liquid base.) Otherwise,
liquid oxygen is paramagnetic, as can be demonstrated by
pouring it near the gap of a strong electromagnet.
(One of my favorite physics lecture demonstrations.)

A friend of mine had the patents on it. It is silicone oil with colloidal ferromagnetic ceramic. I used it to make a simple rotary vacuum seal. The vapor pressure of the silicone wasn't a problem. http://www.ferrotec.com/

Jerry
--
Engineering is the art of making what you want from things you can get.
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