[time-nuts] time-nuts Digest, Vol 53, Issue 46

[Mark Sims]

The quintessential gravity meter (Worden Gravity Meter by Texas Instruments)...  still being made after 60 years or so:
http://www.mssu.edu/seg-vm/pict0246.html


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Geologists measure gravity to get the density of of the underlying rocks.  I 
saw a neat topo map of the San Francisco peninsula at one of the USGS open 
houses.  The contours were rock density rather than elevation.

Of course, they had to correct for elevation.  When I asked how they got the 
elevation, the guy smiled: "From the sewer people".

They had the instrument on display.  It wasn't very big, say a cubic foot.  
Maybe they will have it out at the next open house so I can look closer.


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