[time-nuts] USGS: GPS for seismic work

Rex rexa at sonic.net
Sun May 20 05:55:32 UTC 2012


On 5/19/2012 10:22 PM, Hal Murray wrote:
> Another gadget that I saw was a "two color" laser ranging setup.  It was good
> for 1 mm over 5 km.  (ballpark)
>
I think I saw that too. Pretty old; mid-80's probably. The number 
switches caught my attention. Made me try to figure out the vintage. My 
guess was late 70's but history indicated maybe a little newer than that.





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