Golborne Vintage Radio

Just read about this type of magnetometer.
I was very impressed on how it works, (and its name :-) ) so this will be my next project.

Hydrogen protons in distilled water are subject to a big magnetic field causing them
to rotate (precess) to a new position.

If field is now removed the protons oscillate back and forth to original position and in doing so give off a weak signal picked up by a sensor coil. It's a sound whose freq is a reflection of strength of external magnetic field. So this freq, converted to a voltage, can be recorded over time.

Can easily show variations in Earth's magnetic field which has interested me.

So Hydrogen protons, here I come :-)

Also used for geophysical surveying...

Many years ago, one of the UK electronic rags had a DIY project on this - I built it but not with a huge amount of success.

One plus of these devices is that they work over water.

I dimly remember that article. Possibly in Practical Electronics. 1970s? Ought to be possible to track it down on: https://worldradiohistory.com/index.htm

There's a simple one here in first part of site.
http://ilotresor.com/build-a-proton-prec...netometer/

An advanced one here in this book
Signals from the Subatomic World: How to Build a Proton Precession Magnetometer

Part of book here. Well explained too.
http://www.exstrom.com/magnum/master-Z-H-4.html

Found it: https://worldradiohistory.com/UK/Practic...970-10.pdf

(03-01-2021, 02:52 PM)ppppenguin Wrote: [ -> ]Found it: https://worldradiohistory.com/UK/Practic...970-10.pdf

Thanks for that link. Adds to my info on PPM's

Definitely the one I made - October 70- I was 12.

I didn't get anything published in PE or PW until I was 16.