In a message dated 13/01/00 20:15:40 GMT Standard Time, crpatton@...... 
writes:
  twleiper@........ wrote:
So here is the challenge question:
 Assuming identical detector, gain and filtration (they are) and only the 
difference in period, can you calculate the capacity of the oil truck?
 
 Doug Crice wrote:
 "...whether the drift is caused by mutual gravitational attraction between 
the oil truck and
 seismometer..."
 
>> And just for fun, another idle thought, what about the distortion to the 
Earth's magnetic field due to the large diamagnetic body (the oil) in the 
vicinity. 

>> I must have too much time on my hands. Regards, Charles R. Patton
 
    How has it escaped Mr.Patton's notice that trucks frames are made of a 
lot mild steel, which has a huge magnetic susceptibility cf. oil?  

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