You can buy them...I've seen them advertised in aviation mags. Only a few thousand USD.
Yeah... I've seen them too. I used to work at a US Navy
Level II Calibration lab at the Naval Submarine Support
Facility New London (NAVSUBSUPFACNLON for you milspeak
types) in 1977. We used to have a bank of them to
calibrate the standards that came off the submarines
that were used for navigation (and other!) purposes.
About once a quarter someone would get the choice
assignment of driving down to Washington DC to NIST
to get them calibrated.
About 5 years ago I actually saw one at a hamfest for
sale for real cheap. When I picked it up to look it
over I realized why it was so cheap. Something was
rattling around in there and I didn't want to go any
further in my examination. One of these days I'll buy one,
but it is real low on my priority list somewhere behind
the stuff I am aquiring for my brewery! :-D
Peter L. Berghold -- Unix Professional
Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg
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