Hi Ted-


I have a BB-13 that is complete with manual I and have a plug on mine. It
has standard NF 1/2"-20tpi threads and should be avilable from any
hardwre or auto supply store. Of course, the one that comes on it is a
really nice one with a knurled top, but a commercial bolt with an O-ring
on it should seal until you can get something better. You would need to
get the shortest bolt you could as the plug is 3/8" long (from face of
head to end) and that includes a 1/8" captive groove for the O-ring and
1/4" of threads. 


I would love to talk to you about your instrument and mine. I have been
fiddling with the filtering to detect earthquakes, and have wondered if I
could use it to detct earth tides, I understand that the output goes down
to DC. I built box of hard foam-core insulation around the istrument and
it has really helped with temperature control and has minimized
re-adjusting it.


Hope this helps- George


At 09:21 PM 3/19/2009 +0000, you wrote: 

>>>>

Hi all,


I have a Teledyne Geotech BB-13 seismometer which came without the plug. 
This is the threaded plug that screws into the top of the seismometer (in
place of the locking plug) to seal it during operation.  


If anyone has one, I'd like to borrow it to have a copy machined.  My
BB-13 did not come with it.


Thanks,


Bob Hammond

PSN - Alaska


<<<<<<<<




George