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
------------------------------------------ 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. _________________________________________________________________ Send e-mail anywhere. No map, no compass. http://windowslive.com/Explore/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_anywhere_122008 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
