>As best I can determine, Lehman in the late 1970's
>described a particular two vertical strut instrument that he made.
>Somehow his name stuck to the generic "garden gate" or
>" Golitsyn" type instruments ever since.  I believe that it is
>mostly PSN folks that use the term

I believe when the name Golitsyn is used it refers to the combination
of the swinging gate type pendulum and the electromagnetic pickup.

There were earlier varieties of the swinging gate pendulum.  Modern
Global Seismology by Lay and Wallace refers to an early "Omori"
horizontal pendulum that etched the seismogram on smoked paper
around a rotating drum.  It says it was developed by a student of John
Milne in Japan from 1899 to 1905.  The picture shows the typical
garden-gate style boom but without the magnet/coil we are
accustomed to.  

I think the term "swinging-gate horizontal  pendulum" aptly describes
the style without too much confusion and history.

Of course all mailing list references to this style should now become
SGHP to add to the confusion. :)  

-Mac




_____________________________________________________________________

Public Seismic Network Mailing List (PSN-L)