I have photographs of two vertical seismometers that were made by Jim
Lehman and given to me.  Both have been in continuous operation for
several years and both have a natural period of about one second.  The
smaller unit is in my classroom and the larger one is in the basement
beneath the classroom.  I modified the damping of the smaller unit using
copper plumbing fittings, which makes it both easier to construct and
easier to operate than the larger one.  The web address for going
directly to the photographs is too long to post on an e-mail, so if you
want to see images of both these seismometers go to my opening web page
at=20

http://home.moravian.edu/users/phys/mejjg01/

then click "homemade seismographs," click "Illustrated history of the
seismometer system, 1991 to 1998" and click the links on that page.
Additional detailed photographs of the construction design of the
smaller home-made seismometer can be found at the following web site:
http://www.netquake.org/seismometers/vertical.htm  Unfortunately, I have
not yet gotten around to annotating these photographs, but intend to do
so in the next several days.

=20

Joe Gerencher

=20

=20














I have photographs of two vertical seismometers that =
were
made by Jim Lehman and given to me.  Both have been in continuous
operation for several years and both have a natural period of about one =
second. 
The smaller unit is in my classroom and the larger one is in the =
basement
beneath the classroom.  I modified the damping of the smaller unit =
using
copper plumbing fittings, which makes it both easier to construct and =
easier to
operate than the larger one.  The web address for going directly to =
the photographs
is too long to post on an e-mail, so if you want to see images of both =
these
seismometers go to my opening web page at 

http://home.moravia=
n.edu/users/phys/mejjg01/

then click “homemade seismographs,” click =
“Illustrated
history of the seismometer system, 1991 to 1998” and click the =
links on
that page.  Additional detailed photographs of the construction =
design of
the smaller home-made seismometer can be found at the following web =
site: 
http://www.net=
quake.org/seismometers/vertical.htm 
Unfortunately, I have not yet gotten around to annotating these =
photographs,
but intend to do so in the next several days.

 

Joe Gerencher