S-T Morrissey wrote:

Sean-Thomas probably already knows this, but I found a couple little
things. I think I'd make a decent editor if only I knew English better.
;)
 
> Regarding the HS-1 compared to the L4-C:

I'm sure he/you meant HS-10-1 and not HS-1. The HS-1 is a 4.5 Hz model.
There's also a HS-10-2 for 2 Hz. Mark Products has a L-22 2 Hz model.

> Electrically they can be equivalent if the coils are similar. THey both
> have a 1kg mass and an intrinsic damping (Beta0) of around 0.27..

The mass on the LC-4 is 1 Kg, but the HS-10-1 varies between 33 and 29
oz. Both are a little less than 1 Kg.

A lot of the details for the GeoSpace geophones are online at the
GeoSpace web site. http://www.geospacecorp.com/

Sorry Sean-Thomas,
Greg

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