PSN-L Email List Message

Subject: Re: Early American Seismology
From: GMVoeth GM gmvoeth@.........
Date: Mon, 16 Jul 2012 16:19:43 +0000


On 7/16/2012 1:45 PM, Warner, Deborah J. wrote:
> Check out my blog:
> http://blog.americanhistory.si.edu/osaycanyousee/2012/07/joseph-henry-and-the-origins-of-american-seismology.html
>
> Deborah Warner
>
> Curator, Physical Sciences Collection
>
> National Museum of American History
>
> Smithsonian Institution
>
> Washington, D.C. 20013-7012
>

It would be nice to see in a schematic, exactly how this device would 
function. They did not use much electronics in the times before 1950s.

It seems you might put a tubular electrode where the mass is located
then the ring of metal would be the second plate of a capacitor,
then you could possibly have an omnidirectional horizontal receiver
of seismic waves which is what I happen to be looking for.
It would function much like a AC bridge circuit to pick off
a signal. How damping is happening here is not clear but it seems
easy to work out with such a design.
Since this would be an AC device at like 100KHz to 1 Mhz you
need to be careful of RFI emission in building the final product.
I think I will play with this idea. But I know for sure
someone else already has a functional design of what i seek
since there is today nothing left for the individual
to discover, it takes a group effort. And this stupid copyright stuff
and patents and intellectual rights (rights not in the constitution) 
Like religion are always getting in the way of progress.

Geoff

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